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Demco SBS Air Force One Supplemental Braking System for Motor Homes with Air Brakes - Proportional
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Demco SBS Air Force One Supplemental Braking System for Motor Homes with Air Brakes - Proportional

Item # SM99243
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Our Price: $1,179.95
$1,079.95 after $100.00 Mail-In Rebate
Tow Bar Braking Systems

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SM99243 - Power Assist Brake Compatible Demco Tow Bar Braking Systems
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This truly proportional braking system uses the air pressure from your RV's brakes to apply the brakes in your towed car in the same manner. Low-profile design installs out of your way and is always at the ready. Lowest Prices for the best tow bar braking systems from Demco. Demco SBS Air Force One Supplemental Braking System for Motor Homes with Air Brakes - Proportional part number SM99243 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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Demco Tow Bar Braking Systems - SM99243

  • Brake Systems
  • Demco
  • Proportional System
  • Air Brakes
  • Fixed System
  • Power Assist Brake Compatible
  • One Time Set-Up

This truly proportional braking system uses the air pressure from your RV's brakes to apply the brakes in your towed car in the same manner. Low-profile design installs out of your way and is always at the ready.


  • Supplemental braking system applies towed vehicle's brakes in proportion to braking action of RV
    • Towed car's brakes are activated at the same time and with the same intensity as those in your motor home
  • Truly proportional system uses the air pressure from your RV's brakes to apply the brake pedal in your car
    • Coiled air hose connects air assembly in RV to operating unit in towed car
  • No false braking
    • Coach air brakes must be activated for system to apply towed car's brakes
  • One-time setup - no need to remove or to activate each time you tow
    • Operating unit and actuating cylinder stay hidden so everything is out of your way when you are driving
      • Low-profile design of operating unit allows for more room in the engine compartment of towed car
      • System automatically functions when towed vehicle is connected to RV
  • LED coach notification system illuminates when the towed vehicle's brakes are applied
    • Connects to towed car's brake light switch to ensure proper reading
  • Vacuum-assisted function of towed car is activated with air from the coach brakes
    • Less force is needed to move the brake pedal in the car, resulting in more natural braking and less risk of damage
    • Compatible with vehicles that have continuous-power-assist brakes
  • Breakaway included
  • System meets FMVSS safety guidelines for motor homes that use air brakes
  • Necessary installation components and an instructional CD included
  • Made in the USA


  • Application: motor homes with air brakes
    • Can accommodate air-over-hydraulic brakes - additional 1/4" DOT air line (not included) may be required
  • Coiled air hose length when fully stretched: 7'
  • Breakaway cable length when fully stretched: 7'
  • 5-Year warranty

A supplemental braking system is a must when towing a car or truck behind your RV. Without it, the weight of the towed car can create a safety hazard, strain your RV's brakes, or affect your RV's warranty. Most states require a supplemental braking system.

Automatic, Truly Proportional Braking

Air Force One is a proportional braking system. When you apply the brakes in your motor home, the system will engage your towed car's brakes at the same time and with the same pressure as those in your motor home, creating synchronized braking.

To achieve this proportional braking, Air Force One ties into your coach's air brakes. The patent-pending process uses air pressure from your coach's brakes to depress the brake pedal in your towed car. The result is uniform, real-time braking that mirrors the slowing or stopping action of your coach. Whether you lightly tap the brakes in your RV or apply them hard in a panic situation, your towed car's brake pedal will be applied in the same manner.

Many other proportional systems activate the towed car's brakes based solely on inertia. With this kind of setup, any activity that affects the forward momentum of your towed car - from the coach actually braking, to driving over a pothole - can activate the supplemental braking system and apply your towed car's brakes. This potential for false braking, which can occur simply from driving over uneven terrain, can create a rough ride for you in the RV and can also wear out your towed car's brakes over time. Air Force One is different, though. Because it is tied into your coach's brakes and is not dependent on inertia, this system activates only when you apply the brakes in your RV, so there is no false braking.

Permanent Installation with Concealed Components

Once you install the Air Force One system, it stays concealed and out of your way - both in the RV and in the towed car. Unlike systems that require you to keep the actuating box under the seat or in the trunk of your towed car, Air Force One does not take up valuable storage space inside of your car. And the components that install on your RV all remain hidden beneath the vehicle so that no room is taken up in its interior either. Because the entire system installs permanently, there is no need to constantly set up and remove this system. You never have to worry about where to store a bulky actuator box when you're not towing. And while most of the components do remain on your vehicle and RV at all times, none of them will interfere with normal driving or braking.

Coach Air Connection Assembly

Because Air Force One uses air to activate, it is a natural choice for diesel motor homes that have air brakes. The coach air connection assembly taps into your RV's air brakes and delivers the air necessary to activate the towed car's brakes through the included coiled air hose. The valves on the coach air connection assembly ensure precise airflow.

Pressure Protection Valve

A 1-way check valve collects air from your RV's brake lines so that it can power your towed car's brakes. This pressure protection valve also ensures that your RV's air lines maintain the same amount of pressure so that the braking in your RV is not affected.

Relay Valves

Metered air from the coach's brakes connects to a service relay valve. This relay valve collects air from your RV's brake lines so that it can power your towed car's brakes. When you activate the brakes in your RV, the delivery relay valve releases the appropriate amount of air to the operating unit in your towed car.

The coach air connection assembly is best mounted in a location on the RV where the air lines will not be near direct heat sources or moving parts, such as in front of the rear axle.

Note: Air Force One is designed for motor homes that have air brakes, but it will also work with RVs that have air-over-hydraulic brakes. Additional parts (not included) may be required for installation on RVs with air-over-hydraulic brakes.

Operating Unit

The operating unit, which mounts in your towed car, receives air from the coach air connection assembly. The unit then diverts a matching amount of air through a hose to the actuating cylinder that mounts on your towed car's brake pedal. That air activates the cylinder so that it applies proportionate braking pressure.

The unit goes under the hood of your towed car, so it is out of your way and always ready. Because this system is a universal fit, you can remove it from your towed car and reinstall it in a different car or truck if needed.

Actuating Cylinder

Small Cylinder

The actuating cylinder depresses your towed car's brake pedal upon receiving the air that is delivered from the operating unit. This small cylinder stays mounted on the arm of your towed car's brake pedal at all times and will not interfere with braking while driving.

Actuator on Pedal

Mount this cylinder so that it is perpendicular to the firewall when you depress the brake pedal. A clamp anchors the actuator to the firewall.

To connect the actuating cylinder to the operating unit, you will need to run the included air hose through your towed car's firewall. You can usually create the necessary, small opening without drilling. In most instances, you can cut a slit in the hood release cable grommet. Simply cut the end of the air line at an angle to poke it through the slit.

Coiled Air Hose Connection

Coiled Air Jumper

The coiled air hose, also called a jumper, connects your towed car to your RV by connecting the operating unit to the coach air assembly. When you are ready to hitch up your car and tow it, simply hook up the coiled air hose at the same time as you hook up your tow bar.

Vacuum Pressure Creates Smooth Braking

Normally, when you activate the brakes in your vehicle, a vacuum multiplies the pressure you apply to your brake pedal, creating the force necessary to stop the full weight of the moving car. On most cars and trucks, this vacuum-assist function does not work when the engine is off. As a result, many supplemental braking systems on the market have to use an excessive amount of pressure to effectively depress the towed car's brake pedal.

Air Force One reactivates the vacuum-assist function of your car's brakes when it's being towed, even though the towed car's engine is not running. As a result, the actuating cylinder does not need to apply extreme force to the brake pedal to achieve proper braking. The operating unit ties into your towed car's vacuum line with a tee so that it can use the air pressure from your RV to create the vacuum your car needs to brake gently. As a result, no additional vacuum pump is required to create the vacuum-assist function for your towed car's brake pedal. Air Force One will replenish your towed car's vacuum after each braking event so that you will get smooth, even braking every time.

Built-In Safety Features

AFO Light in Towed Car

Most supplemental braking systems have methods of letting you know you when the system itself is activated, regardless of whether the towed car's brake pedal is depressed. Such setups leave opportunities for false notification. Air Force One's system is different. This system's LED monitor connects to your towed car's brake light switch. When your car's brake light goes on or off, so does the notification light. So you can tell whether your car's brake pedal is depressed.

Air Force One Monitor Install

You can install the monitor light on your RV's dash, or you can save time by attaching the monitor light to the back of the rearview mirror of the towed vehicle. This way you can see the light from your RV's backup camera or rearview mirror. The system includes the necessary parts for either installation method.

Note: If the towed car's brake lights do not activate when the engine is off, a stop light switch kit (sold separately) is required for accurate notification.

AFO Breakaway

The breakaway system ensures that your car will come safely to a stop if it accidentally detaches from the RV while you are towing. A switch mounts to the front of the towed vehicle. This switch - which is wired into the operating unit - includes a pin that connects to your RV's hitch receiver with a breakaway cable. If the car separates, the cable pulls the pin from the switch, causing a signal to be sent to the operating unit. A reserve air supply will then apply your towed car's brakes. This system also has "total coach protection" built in. If there is separation, the RV's air supply is sealed off, so its brakes will continue to function as normal.

Air Force One meets Federal Motor Vehicle Safety Standard (FMVSS) guidelines requiring that supplemental braking systems use a separate air supply and activation relay valve.

9599007 AFO115 Demco SBS - (Formerly SMI) Air Force One Supplemental Proportional Braking System

Replaces Demco SBS SM99202 and SM99243

Installation Details SM99243 Installation instructions

This Product Fits The Following Vehicles

Video of Demco SBS Air Force One Supplemental Braking System for Motor Homes with Air Brakes - Proportional

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for SMI Air Force One Braking System Installation - 2018 Ford F-150

Speaker 1: Today on our 2018 Ford F150 we're gonna be installing SMI's Air Force One supplemental braking system, part number SM99243. The Air Force One braking system is gonna provide you with supplemental braking while pulling your vehicle behind your RV. It's gonna use the air braking system on your RV to supply an airline back to your vehicle which will actuate your braking system using the supplied operating unit.It comes with an emergency breakaway switch so in case your vehicle happened to become uncoupled from your RV while going down the road this pin will get pulled and it will apply the brakes on your vehicle, bringing it to a halt to prevent any accidents from occurring. There's an indicator light that's installed on the back of your mirror, this way when you brake on your RV you know that your vehicle's braking because this light only activates when the actuator in your vehicle is pulling the brake pedal. What I really like about this system is that it's minimal in comparison with others. The components are smaller, it has less wiring, and using your existing air supply on your RV makes it actuate proportionally giving you some of the best braking performance you can get.Now that we've gone over some of the features let's show you how to get it installed.

We're gonna be starting with the vehicle, but there is some components that you'll need to place on your RV as well. Before you begin the installation you'll need to find mounting locations for some various components. We've already selected some locations and mounted the hardware there, these are not the necessary positions they need to be in however we've decided these are the most appropriate, out of the way, and best looking positions. We've mounted our control unit next to our cooling bottle up on top of our core support, we we're able to mount it just by drilling a couple holes in a little bit of the plastic, and secured it with zip ties to the handles on each side. We've mounted our breakaway switch to the metal beam that runs just below our license plate.

I did upgrade to a larger self tapping screw that does not come included in the kit, if you need to get some self tapping screws you can pick some up here at etrailer.com.We then secured our air actuator to our brake pedal and mounted the anchor point to the firewall located here, using a self tapping screw provided with the actuator. It was necessary to cut away some of the carpet on the firewall so we could have a secure mounting point to the metal beneath it. Both the actuator and the self tapping screw we're tightened using a three-eighths inch socket. Placement is a very important decision when mounting your actuator, you want it to be as low as possible to get the most power out of it because you'll have the most leverage on your brake pedal but you also want to make sure that it's got a true path to pull straight into your anchor point, this will prevent any chafing on your cable here to make it long lasting and reliable.We're gonna route our tubing from our control unit down to our connection point on the bumper and we're also gonna run our breakaway wiring up to our control box. To begin that, to make it easier to route the wiring, we're gonna remove the plastic trim located above the radiator, you can do this with a flat bladed screwdriver or with a trim panel remover tool.

There are 13 push pins that have to be removed, pry up on the center then you can get underneath and pry the entire pin up, repeat that for the remaining 12 pins.We're now gonna run a piece of airline tubing down from the top down below so we can connect it to our breakaway wires and run them up. You can use a coat hanger or anything else that's kind of rigid but still flexible to allow you to route it as you need. It's much easier to go from top down than from down up. Before we connect it and make all that running that we we're gonna do we're gonna go ahead and mount our quick connect to our vehicle here, we've already got the line run up and through the hole that we've made so we'll start by connecting that airline tubing, you'll push it in, make sure you get it all the way in, I like to go in and out a few times just to make sure that it's fully seated.Once you know you've got it seated you can poke that up in there and we're gonna use some self tapping screws to secure it to the metal beam here. We've already drilled some pilot holes to make it easier on our self tapping screws, now the self tapping screws are not provided in your kit.

I've already drilled a hole here located on our bumper for our wiring to poke through, we're gonna go ahead and poke that through now, you can reach up on the backside to grab the other end and pull that wiring all the way through.Our breakaway wires are not gonna be long enough to reach from our mounting location up to our battery and control unit so we're gonna go ahead and extend those now before we make the run. Go ahead and strip back some of your wiring. I'm gonna crimp it to some bulk wiring, you can pick up some wiring here at etrailer.com. We're gonna connect the blue to the blue and the red to the orange and black as this is gonna go to battery anyway. Now the butt connector choice that we've chosen was the blue heat shrink butt connectors, this way we can shrink it down, seal up our wiring, and we don't have to worry about corrosion in the future. You can pick up some of these heat shrink butt connectors here at etrailer.com.Now we've made all of our preparations that are necessary to get our wires up so we're gonna connect them to the airline hosing that we ran down from the top. We'll use some electrical tape to make this connection which will allow us to pull it right back up, routed in the way that we desired. Now just pull on your airline or whatever you ran it with and pull up all your excess. Now our air tubing is much longer so there is still some below we'll just have to separate it and continue pulling that airline up.Now that we've got our airline hose routed up I went ahead and made a little loop, zip tied up some excess so that way we've got some for any future repairs that may need to be made. Then we're gonna go ahead and trim our airline to the appropriate length, you can pick up one of these airline trim tools here at etrailer.com. This tool makes sure that it cuts flush and clean so it'll seal properly. We're then gonna connect this to the quick connect fitting labeled air in, again this is the one that's going from the front of our vehicle that'll connect to our RV will also go to the air in, same hose. We'll just poke it in there, again this is a quick connect so you'll want to make sure you've got it fully seated, kind of poke it in and out just to make sure that it's all the way in there.We're now ready to connect our wires from our control unit. They're both black wires and you can't really mix them up, it doesn't matter which one you connect where, one's gonna connect to ground and the other will connect to the blue wire from our breakaway switch. We'll start by connecting our ground, again I always like to leave a little bit of excess just for that future proof. We'll trim off any remaining excess that we don't want and connect this to a ring terminal. Now the ring terminals provided in the kit are gonna be the smaller blue ones, you can connect those to any ground point using a self tapping screw such as your body we decided that we're gonna go right to the battery here. Since we're right there this is a good post, but we're gonna have to upgrade to a larger ring terminal, you can pick up one of these larger yellow ring terminals here at etrailer.com.We'll then use a 13 millimeter socket to remove the bolt on our negative terminal, slide on our ground wire, just gonna route it underneath our air hose, and then reattach our nut. Now again we're gonna trim off any extreme excess but leave a little bit so we'll start by trimming our blue wire and then we'll trim our black wire, strip back both ends, and connect it with one of the butt connectors provided in the kit. Now once again we have decided that we're gonna upgrade ours to a heat shrink butt connector.We'll now need to route a power wire and our airline tube for our actuator into the cab of the vehicle. There's a grommet located in the lower left corner on the drivers side we're gonna again use that airline tube to push it through to help feed our wiring through. I've already gone ahead and made a little pilot hole off to the side of the wiring just to make it push through a little easier. Then you can come on the other side and pull that line through so we can make our connections.We'll now take the rest of the black airline tube that we have left and the brown wire provided in your kit and tape it to this airline tube that we ran through, that'll make it much easier to get everything fed into the cab. Now that you've got it all taped up just go ahead and feed your airline tubing back through to pull it inside. We can connect our air hose to our actuator again we just want to press it in, get a little tug back and forth to make sure it's fully inserted. Then I went ahead and just routed this wire up a little bit and then came back down just to make sure it's gonna be out of the way in the foot area so we don't kick it.We're now ready to make our electrical connections, we'll need to begin by mounting our LED strip on the backside of our mirror. Just peel off the adhesive backing, we're gonna aim the wire up, we're just gonna find a nice smooth spot kind of out of the way and stick it on to the backside of the mirror. We can then route our wiring down our headliner, down our A pilar, to where our brown wire was pulled through. We went ahead and pulled our weather stripping back to make routing it easier. Starting at the bottom work your way up along the side of the panel, releasing all the push pins. Now we can route our wire inside down to make our connections. Then just reinstall your panel and weather stripping, they just push back into place.We'll now need to connect our switch to the LED wires that we just ran. The blue wire will connect to the black wire and these also need to go to ground. There's a ground stud that we're gonna be using along the side here and the length of wire is long enough to where we can just put a ring terminal on it and connect it to that stud. Now in order to connect to the stud the ring terminal provided in the kit is too small to fit over the stud so we're upgrading it to a larger connector, this will prevent us from having to drill any self tapping screws for it to get that ground point.Go ahead and cut off the tip of the black wire and the blue wire and then we're gonna strip both of those back. We'll then twist those together so we can connect it to a single ring terminal. We then stripped back the red wire on our LED and the black wire on our read switch and we're going to connect to those with one of the crimp connectors in the kit. Lastly you'll connect the brown wire to the brown wire that we ran in from outside.We're now gonna connect our ground point, there's a stud located here on the lower left kick panel area, we're gonna take the nut off with a 13 millimeter socket. Remove the nut, take the ring terminal that we connected to the blue and black wire, slide it over the ground stud, and reinstall the nut. We've routed our brown wire across the outside of the firewall down over to our battery positive where we're gonna make our connection. First we're gonna connect our fuse so you'll want to take the loop at the end, cut it in half, and then strip back both ends. Connect one of the blue ring terminals in your kit to one end of the fuse and crimp it on. Then take your red and your brown wire, strip those back, twist them together, and connect them to one of your butt connectors in the kit, we did again opt to upgrade to that heat shrink butt connector. Then connect your other end to the other end of your fuse then crimp it together.We'll then connect the ring terminal on our fuse to our battery positive terminal by removing the nut with an 11 millimeter socket, slide on your ring terminal, and then reinstall the nut. We then routed our black airline tubing in the same manner across, tucking it behind the felt material on our firewall, running it up along next to the battery over to our control box. We did leave a little loop here just so we've got some excess for future repairs if needed. We're gonna use our airline tool again to make sure we get a clean cut and this line will connect to our air out again, this goes to the air actuator on our brake pedal. Then slide it into place, go in and out to make sure that you've got it fully connected. Then you can tidy up all your wires and airlines with the zip ties provided in the kit. Making sure everything stays out of way of anything hot or moving components.We now need to tap into our brake booster vacuum line. Here's our brake booster here and our vacuum line coming off. We're gonna tap into the line right here because it's a nice straight area so it'll make it easier to make our connection. You'll need to begin by cutting the line in half. There may still be some vacuum on this line, if you're worried about that vacuum making some noise or whatever it's not a big deal but you can go press the brake pedal to relieve that vacuum.Now you're gonna want to cut a few segments of two inches of your hose from your kit to connect to your T fitting so we're gonna go ahead and make those cuts now at about two inches. Now since we have a plastic line we are gonna need to cut one additional one to install our check valve. Now we need to connect our T fitting to the hoses we cut, we're gonna put one hose on one side, this will go to our brake booster, the other side is gonna go towards our engine so slide on your piece of hose. Now let's put a check valve between our T fitting and our engine, the black side needs to face towards the engine. We'll be putting the white side towards our T fitting, we'll then need to take the other small piece we cut and put it on the other side of the check valve. We can now hook this in line with our brake booster vacuum line.Here you can see we've got our hoses installed, our engine side has the vacuum line with the black facing towards the engine. We did have to cut out a little bit of section of this hose in order for this line to fit in place and when we cut out that section we did cut it at a slight angle, that helps this hose fit on a little bit easier because it is quite a tight fit. Once you've got them on tighten down your hose clamps and we're ready to hook up our line that'll go to our brake control unit.Now take the excess hose that you have, connect it to the T coming off where we just made a car connection, making sure that that hose is pushed down all the way, twisting it back and forth can help get it on there a little easier. Then just route your line up and over to your operating unit and cut your line off flush, give yourself a little bit of excess. Now that you've got your hose cut to length you want to go back about six inches and then cut this hose because we need to put our check valve in between there. We'll be placing the check valve with the black end facing towards the operating unit and then connect your hose to your operating unit making sure that it's fully seated. Now you can go back and clean up your hose, zip tying your vacuum line so it's away from any hot or moving objects. Now we can install our fuse.Now you want to verify that your brake read switch is working properly. As you can see now the light is not illuminated so our light on the back of our mirror's not illuminated. If you pull out on it slightly which simulates if the brake pedal is being pulled the light on the switch comes on which also illuminates the light on the back of your mirror. You want to make sure you have it adjusted properly so it comes on after about an eighth inch of travel. Once you've got it set there's a small set screw on the back of the switch, you need to tighten that down to lock it into place.Now we've already mounted our tank, we mounted it on the other side of this compartment making it easy to drill out and run the bolts through, I'll show you where that tank is now. We've mounted our air tank here, right on the backside of that compartment. You want to make sure that your relay valve is facing down, especially with the diaphragm here facing down. It's best to have a helping hand hold those nuts if you are gonna mount it in this location because it's a bit tedious to hold while turning them if they are lock nuts to hold them in place.Now we'll need to splice into our supply line for our air brake system on our RV. We're gonna be here right in front of the axle because that's where our locations for our hoses are. If you look upwards, just in front of the axle, it'll have all of your supply lines up here. We're gonna be cutting into our supply line and our metered airline. We've got them both marked with some blue tape to make it easier to see.We'll need to tap into this line so you'll need to use a hose cutter to make sure that you cut it evenly and it's best if you give yourself a little room before the actual fitting. We're actually gonna remove this tape now so we can get the best cutting point on it. Before you cut this line it is important that you drain the air out of your air brake system. One way of doing this is just pumping your brakes until the air is gone. Now we can cut our line. After you cut your supply line we're going to install a T-fitting in between it. This will be the large T fitting in the kit, go ahead and slide that on one end. Again you want to kind of push in, pull out to make sure you get it sealed properly so we don't want any leaks. Then again we'll connect it to our other side.Now we'll cut our metered air supply, it's the other one that we have here marked with the blue tape. In between these two we'll connect our small T fitting, slide it on to both ends. We'll now connect our quarter inch air line that we have left over to our fittings, making sure we've got those all the way in. Hook one up to your supply line T fitting then you'll have to cut a length of hose that goes back to your air supply and you'll take another length of your air hose and connect it to your metered air T fitting.We've now got our lines run back to our air tank, this line is the one that was connect to the larger T fitting, our air supply line. It's gonna connect to the valve on the side of the tank, go ahead and run that in, making sure it's pushed in all the way. Next we'll hook in our metered air line, this is the one that hooks to the small supply line. It's okay if you've got a little bit of excess, this is actually a good thing so in case you need to make future repairs you've got a little bit to work with. This one's gonna connect on top of your relay valve so between the relay valve and the tank, just push that in there making sure it's fully seated.Now you can use the rest of your hose to connect your relay valve to your connection point at the back of your RV. If you don't have enough air line left you can buy some additional airline here from etrailer.com using part number F9153. Then the rest we'll route to the back, again if you've got excess that's okay, we can always tie that up, it'll be useful for repairs if need be in the future. We'll then connect the other end of our airline to the bracket located here at the back. We connected this using a short bracket connected to our hitch.Now all you need to do is go back and clean up the routing using some zip ties, it's best to put it next to your factory wiring because you know it'll be out of the way. Now we can plug up our airline to our RV and to our vehicle and make sure everything's working properly. As you can see here when we press the brakes on our RV it pulls the brake pedal on our vehicle.That completes our installation of SMI's Air Force One supplemental braking system on our 2018 Ford F150.

Customer Reviews

Demco SBS Air Force One Supplemental Braking System for Motor Homes with Air Brakes - Proportional - SM99243

Average Customer Rating:  4.9 out of 5 stars   (67 Customer Reviews)

This truly proportional braking system uses the air pressure from your RV's brakes to apply the brakes in your towed car in the same manner. Low-profile design installs out of your way and is always at the ready.

- SM99243
2019 Ram 1500

Purchased the Air Force 1 through trailer. Great price, sales staff very knowledgeable, and technical support assisted me with installation. I would highly recommend etrailer. 613790

- SM99243
2018 Ford F-150

Very happy with etrailer for the purchase of a Blue Ox tow bar with needed hook ups for lights, etc and an Air Force One Brake system for my 2018 F150. Crystal did a great job of comparing options and matching pricing from across the web. She offered free installation. The Installer, Shane was awesome, I wanted all hookups hidden by the front plate on the F150 when not towing, Shane came through and then some. Finally, the manager Robert was excellent on follow-up as we had some air leak once we got home. etrailer stood behind everything and follow was exceptional. Very pleased! 553768

- SM99243
2018 Chevrolet Equinox

Great breaking system , I installed the unit on my 2016 Equinox ,and our new 2018 Tiffin Phaeton.Most dealers don't want to cut into the Coach air system ,hey grow a pair it's no big deal . They just want to sell you the big clunky box then you have to deal with that . Air Force 1 just disconnect jump in , throw a switch and go . Recommend to all . 580338

- SM99243
2012 Ford Focus

The kit came complete and instructions are clear and very helpful. I did need to call before buying to ask a couple of questions and received extremely knowledgeable and courteous advice that helped make my decision easy. Thanks so much for your product and support. 289217

Thanks for the follow up letter. We have only towed the vehicle twice for very short distances since installing it but will be going full time on the road in another week and a half and will put it to the test then.
Ron - 10/27/2017


- SM99243

I consider myself an average driveway mechanic. Give me a good set of instructions and the right tools and I'll tackle just about any project. But to make sure you don't get the wrong idea, I don't do mechanic work for a living, it's just a hobby. Having said that, the SMI Air force One installation was reasonably straightforward with the exception of the coach air tank assembly. I have a 2005 Itasca Meridian 34 foot DP, and I had a heck of a time finding a space large enough to hang to the tank assembly on the under carriage. Even so, I had to add a brass fitting or two to change routing of the air lines for clearance. After the tank assembly was installed, I fired up the diesel and discovered that my air system would not hold pressure. So I crawled back underneath the motor home and found that I hadn't firmly seated one of the air lines to the tank assembly. Once I reseated the air line, the pressure held steady. I found the instructions to be very helpful, just bear in mind that installations on different brands of coaches may require some ingenuity to make things fit. Personally, I found it took more time to install the equipment in my car than it did on the motorhome. Finding a place to install the operating unit and hoses so they would not interfere with normal engine maintenance takes a lot of thought. Also finding a route from the passenger compartment to the engine compartment is a definite challenge. All in all, the instructions are complete, but it's still a lot of work. If you don't like puzzles, trial and error, and being a contortionist, I would leave the install to the professionals. But if you don't mind bending your body like a pretzel and are handy with tools, go for it. And don't be afraid to call SMI or e-trailer for help. 237647

- SM99243
2014 Cadillac SRX

Great supplement braking system! After the initial installation, no setup to tow other than hooking up the air line between your coach and the tow car. ETrailer ships fast! 583267

- SM99243
2007 Honda CR-V

Excellent products, shipped as promised and arrived on time. I have installed all the products. Although it took me longer then a professional installer, I had little to no issues. The online installation videos for all the parts (which were attached to the online order status sheet) made it extremely easy to install. The videos were of a professional actually installing the equipment step by step. etrailer.com has a customer for life. 508326

- SM99243
2012 Saturn Relay

"Out of sight, out of mind" would be the best description I could offer for the Air Force One supplemental braking system! When properly installed, it's effective as well as quick and easy to hook up. Connect the tow bar, safety cables, safety switch cable, tow plug and air line, you're done! Five minutes at most. I did add a couple of features to my towing system: 1. Using a relay and the extra wire in the connector to the coach, I installed the LED indicator strip on the dash of the coach; no need to rely on the back-up camera to verify operation of the brake cylinder. Coaches that have a tow connector are usually equipped with a power wire to the cab for electric brakes - this wire is a good way to get the indicator signal to the front of the motorhome. 2. I used the 12 V power connection from the coach to connect a charging wire to the car battery to ensure it would not discharge; I used an auto-resetting breaker with a rating below the glass fuse in the 12 V circuit to prevent a fuse from blowing if the charge current gets to high. In all, a great investment! I have an article I wrote on the install if anyone is interested. 598284

- SM99243
2014 Mini Clubman

Great product. I did the coach side install, my local shop did the tow car install. A tight fit under the hood of a Mini Cooper but it worked great. Had a minor problem with the vacuum check valve failing, but SMI was great about sending a replacement to me. (there was some sort of gap on getting registered due to purchasing this from etrailer) Also had to wait longer than I expected to recieved this product.. no doubt was shipped to order to etrailer, then to me... instead of from stock. 372143

- SM99243
Jeep Wrangler

Hello I would like to take the time to review these products so that other customers will have some level of comfort with their purchases. I all started a year ago after the purchase of our new Allegro bus motorhome. We realized that we would need a tow vehicle to really enjoy the motorhome vacation experience. After a little research on the internet and from other motorhome magazines , we decided on a jeep wrangler for the towed vehicle. Never have towed a jeep, I contacted etrailer and they made some recommendations. At the time I didn't know if I would need all the stuff they recommended, but with a policy I could return what I didn't need. Well they were spot on I needed it all. I must say after towing 12000 miles from Ca to Yellowstone and then on to Red Bay Alabama, and back to California this equipment has performed perfectly . I am glad I found etrailer and talked to one of their salespeople and that they had the knowledge to recommend the accessories so I could install them myself and enjoy the journey and do it safely. After talking to many fellow rv owners they told me that I had bought the best equipment possible, I told them I would like to take the credit, but honestly I just purchased what was recommended by etrailer. 2018 Allego Bus 2017 Jeep Wrangler Rubicon SMI Air Force One Blue Ox Base Plate Blue Ox Hitch Reciver stabilizer .( A must have accessory, stops the rattle of the hitch) Blue ox tow bar ( Aventi 10000 lb hitch) I hope this review helps, and makes you trip a safe one. I know that when we pull out of the campground this equipment makes us feel safe. It is just nice knowing that everything works to make it as easy as possible to hook up and disconnect the toad. 577942

- SM99243
2016 GMC Canyon

Vehicle 2016 GMC Canyon Diesel. Installation of the SMI Air Force One supplementary braking system was not too difficult. The instructions from SMI were good as was the video from etrailer. The only reason that I didn't give it a 5 star is because the air cylinder installation on the brake pedal was complicated by an unusual shape of the brake pedal arm. I eventually found a solution. Tapping into the truck's vacuum line was a little difficult but the kit included everything I needed to T into the vacuum line and install the check valves. All in all not a bad installation, this summer we'll see how it holds up. 371137

- SM99243
2004 Chevrolet Avalanche

Pulled entire length of route 66 and then some. We had absolutely no issues with all of our etrailer equipment. Thanks for all of your help. 601732

- SM99243

Top notch system for tow vehicle if you Motorhome has air brakes. 750055

- SM99243

Works great! 739035

- SM99243

Very quality set up and works flawlessly once in place. But you need a certain level of mechanical skills, and patience, to install. But the instructions are very clear and if followed in proper sequence you will not have any issues.. 738728

- SM99243
2015 Jeep Wrangler

Just unpacked unit. All parts were accounted for. Looking foward to installing it on my 2015 Jeep Wrangler Sahara 2 dr. Arrived on schedule. 723367

- SM99243

We love our Air Force One braking system. The confidence it was done right by etrailer allows us to tow our 4x4 van without worrying about it! 721074

- SM99243

I’ve fitted it to my Jeep Wrangler then taken of and fitted to our new Jeep Grand Cherokee. Works perfectly . I had used our 53ft coach without it and in an emergency stop, was a problem stopping in the rain. Now we have had a couple of fast stops and it works great, would be without it. 714289

- SM99243

The Air Force One supplemental breaking was not very difficult to install in my 2500 diesel RAM. You do need a bit of skill but don't need to be an expert. The system works extremely well and is out of the way when you're not using it for towing. You never know it's installed in your vehicle until you need to connect it to your rig. I didn't install the Rig portion myself because we had just purchased a new rig 1100 miles away from home and didn't want to have to do a field install without knowing what I was doing. It would have taken me too long and the RV park might not have allowed it. I highly recommend this product. 690145

- SM99243

This product worked flawlessly on my 2013 seirra 4 wheel drive. Shipping and customer support was lightning fast. Cudos to etrailer. 682351

- SM99243

Delivered quickly and in good order. Adam was most helpful. 655979

- SM99243

Price was good. Easy to install and video was a huge help. 644021

- SM99243
2014 Jeep Wrangler

Just finished a 10,000 mile trip trailering a 2014 Jeep Wrangler with Air Force One braking system and we are very satisfied with the product. No issues or failures and once installed, it is very easy to use. We can connect and disconnect from the Air Force One and our Blue Ox towing system in 2-3 minutes. 642897

- SM99243
2017 Jeep Wrangler

SM99243 Review: I have a 2017 Jeep Wrangler and needed a way to hook it up to my 1991 Hawkins Diesel Pusher Motorhome. The etrailer staff was very helpful in helping me purchase the correct system. I purchased this system because it seemed to make the most sense. Once installed it is seamless. Nothing in the way, works every time. The indication LED is handy if you have a back-up camera on your MH. I use the RM-521448-5 Base Plate and the RM-676 Nighthawk Tow Bar. 5 Stars! 635931

- SM99243
Chevrolet Silverado

The dealer I bought my motorhome from in Massachusetts wouldn't install the AF1 because it required tapping into the MH's airlines. Was traveling to Maryland and couldn't find an RV dealer there to install it either. Finally found a service center outside Gettysburg, PA who was willing to install and had a technician who had previously done several units. Installation went without a hitch. Have traveled down the east coast to Florida, across south to New Mexico then north to Wyoming. Trip has included the mountains in New Mexico and Colorado. Have had no issues with the AF1 and seems to do its job well. I like that I don't have anything to disconnect and store inside my toad like you have to with other designs. I don't even know it's there. SMI should consider finding a way to attach the dust covers for the vehicle connections to the chord as I've almost lost them a couple times. I do have to reposition the LED lights attached to the rear view mirror of the toad because the backup camera on my MH doesn't show that far up on my toad (2001 Chevy Silverado). Will likely move them down on to the dash itself or see if I can adjust the camera. All in all, I'm very satisfied with system. 635826

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Ask the Experts about this Demco Tow Bar Braking Systems

  • Replacement Actuating Cylinder for SMI Supplemental Braking Systems
    I believe you are referring to the actuating cylinder and there are replacements available, depending on which SMI system you have. For the SMI Air Force One Supplemental Braking System for Motor Homes with Air Brakes # SM99243 you need the Replacement Duo Actuating Cylinder for SMI Air Force One Supplemental Braking System # DM6210. If you have the SMI Stay-IN-Play DUO Supplemental Braking System # SM99251 you need the Replacement Duo Actuating Cylinder for SMI Stay-IN-Play Supplemental...
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  • Availability of SMI Air Force One Kit for Just the Towed Vehicle Side
    For just the vehicle side of the SMI Air Force One # SM99243 what you need is the Second Vehicle Kit # SM99209. This comes with just the components that install on the towed vehicle.
    view full answer...
  • Parts Needed To Install SMI Air Force One Supplemental Braking System On Spartan K3 Chassis
    In order to install the SMI Air Force One Supplemental Braking System part # SM99243 on a Spartan K3 Chassis with toad vehicle fitting all you will need is the SMI Second Vehicle Kit for Air Force One Supplemental Braking Systems part # SM99209 and the SMI Air Force One Coiled Air Jumper Kit for Spartan Chassis part # SM6296. The Air Force One Tank Assembly is already installed on the Spartan Chassis as you mentioned.
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  • What is Needed for the Towed Vehicle with the SMI Air Force One
    There are several components that come with the SMI Air Force One Supplemental Braking System for Motor Homes with Air Brakes part # SM99243. The majority of these components get installed on the towed vehicle. If the previous owner did not provide the towed vehicle components and did not remove anything from the motorhome then the SMI Second Vehicle Kit for Air Force One Supplemental Braking System part # SM99209 will be all that is needed. If they did remove any of the components for...
    view full answer...
  • Recommended Equipment to Flat Tow 2017 Cadillac Escalade 4WD with RV That Has Air Brakes
    Flat towing a vehicle behind an RV requires a few items, including base plates, a tow bar and a braking system among others. These and all other items for safe and legal flat towing are outlined in the linked article. To flat tow a 4WD Escalade it must have a 2-speed transfer case that has both Neutral and 4WD Low settings. Blue Ox base plate kit # BX1716 is a good choice for your 4WD. Our in-house installers like the Blue Ox gear. For a tow bar I suggest their Alpha # BX7365 which includes...
    view full answer...
  • Removing the SMI Air Force One from Toad for Re-Installment on Different Vehicle
    Removing the SMI Air Force One Supplemental Braking System # SM99243 requires removing all of the installed components so that you can reinstall them. You'll need to disconnect the Operating Unit, the Male L brackets, Breakaway Switch, actuator cylinder, monitor light and cylinder switch; basically the same installation process in reverse. You'll also need to remove the T from the vacuum hose and either replace the vacuum hose in the tow vehicle or replace the T with a new section of hose....
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  • Replacement Vinyl Caps for the SMI Air Force One # SM99243
    Yes, we do have replacement vinyl caps for your SMI Air Force One Supplemental Braking System for Motor Homes with Air Brakes # SM99243. For the RV side you will want the Cap part # SM99609 and for the vehicle side you will want the Cap part # SM99608.
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  • Using SMI Air Force One Braking System on 2016 GMC Canyon Diesel with Battery Disconnected
    I took a look at the online owner's manual for your truck and was able to verify that the negative battery cable should be disconnected when flat towing the truck. With that being said, the Roadmaster Automatic Battery Disconnect with Switch # RM-766 referenced in your question is not recommended for use on diesel engine vehicles like yours. This is because with the high compression ratio of diesels the engine can surge up to 10 times that of a gasoline engine at start up and potentially...
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  • Estimated Installation Time for SMI Air Force One Braking System
    I reached out to my contact at SMI and he said that for both the RV and your 2017 Chevy Silverado you're looking at a total install time of around 5 to 6 hours for the Air Force One Braking System # SM99243. I have attached an installation video on the 2017 Silverado that you can use for reference along with the written manual.
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  • How To Power Brake Lights On A 2020 Chevrolet Equinox While In Tow Mode
    The stop light circuit on a 2020 Chevrolet Equinox will go dead while in tow mode after a few minutes of inactivity so in order to use the vehicle's taillights to signal you will need to install a stop light switch kit, the Roadmaster Stop Light Switch Kit part # RM-751489. This will then work alongside the Air Force One Supplemental Braking System part # SM99243 as well. I have attached for you below a list of other parts you may need. Roadmaster Direct-Connect Base Plate Kit part #...
    view full answer...
  • Can the SMI Air Force One Braking System be Installed if Vehicle Has Adjustable Pedals
    That is a great question! Demco/SMI has actually already thought about vehicles with adjustable pedals, like your 2019 Ram 1500, when installing the Air Force One # SM99243. Basically you just need to adjust the pedal so that it sits closest to your seat when installing the Air Force One and then move it to this position when flat towing your pickup. Their official statement (found in the attached installation instructions) says: Special attention must be given to vehicles with adjustable...
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  • Video of Install for SMI Air Force One Supplemental Braking System on 2017 Ford F-150
    We are not affiliated in any way with installers apart from our own, which are located in Wentzville, MO so there is not a list I can offer for installation of the SMI Air Force One Supplemental Braking System for Motor Homes with Air Brakes # SM99243. However, if you make some calls to certified mechanics or shops in your area you are very likely to find someone who is qualified to do the installation. I did add a pair of links to video installations showing this system being installed...
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  • How Installed SMI Air Force One Receives Power While 2016 GMC Canyon Being Towed
    The power and functionality requirements of the Air Force One System, Item # SM99243, are taken care of when it is directly attached to the vehicle battery during installation. Everything will still function even if the negative cable is off of the battery because only the positive terminal and a ground location are needed The Air Force One works by engaging the brakes for a towed vehicle when it receives air from the coach air connection. It diverts a matching amount of air through...
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  • Parts Needed to Flat Tow a 2016 Hyundai Veloster Turbo
    According to my research the 2016 Hyundai Veloster can be flat towed as long as it has a manual transmission. The Turbo model, like yours, can be flat towed. The automatic transmission models must be towed on a tow dolly or trailer. You should check your owner's manual to make sure this is the case. To flat tow the Hyundai you'll need the tow bar, a base plate kit which is separate, safety cables, a braking system, lighting, and likely a high-low adapter. The Roadmaster Falcon...
    view full answer...
  • Installation Video for SMI Air Force One Braking System for 2018 Jeep Wrangler JL
    We had the chance to install the SMI Air Force One part # SM99243 that you referenced on a 2017 Jeep Wrangler Similar to your JL model. I attached the install video to this page that you can use as a guide for the process. This will be more helpful than printed instructions, but I attached a link to them as well.
    view full answer...
  • SMI Supplemental Braking System for an RV with Hydraulic Brakes
    The SMI Air Force One Supplemental Braking System # SM99243 is for a motorhome with air brakes to power the brakes on a vehicle being flat towed. Instead use the SMI Stay-IN-Play DUO # SM99251 for an RV that has hydraulic brakes. This applies the brakes of the vehicle being towed using the motorhome's brake light circuit.
    view full answer...
  • Supplemental Braking Systems to Flat Tow 2019 Jeep Cherokee
    The Blue Ox Patriot III BRK2019 works pretty simply; there is a remote in the cab of your RV and the system will be in your 2019 Jeep Cherokee. The remote will sense the deceleration of the motorhome and uses a long-rage radio frequency to send a signal to the brake system in your Cherokee to apply the proportional amount of braking power. This is a good system but does require you to constantly install and remove the device each time you want to flat tow. A simpler solution and the...
    view full answer...
  • Does the Reed Switch Eliminate the Brake Light Switch on an SMI Braking System
    According to the installation instructions for the SMI Air Force One Supplemental Braking System for Motor Homes with Air Brakes part # SM99243, the reed switch attached to the actuator will power the LED. The brake switch will no longer be providing the signal for the monitor light. Exercise caution when installing the reed switch. If the reed switch arcs to ground, it will either no longer work or cause the LED to stay illuminated at all times. You can reference the installation of...
    view full answer...
  • Availability of Replacement Parts for SMI Air Force One Supplemental Braking System SM99243
    We do offer replacement parts for the SMI Air Force One Supplemental Braking System # SM99243. These items include a replacement Installation Kit for the motorhome, part # SM99627, a Replacement Towed Vehicle Installation Kit # SM99226 as well as other smaller individual parts such as a replacement Air Jumper # SM99666. You can see all replacement parts by clicking on the linked page for the Air Force One and scrolling down to the heading Replacement Parts.
    view full answer...
  • Best Supplemental Braking System for Flat Towing 2015 Ford F-150
    The flat-towing supplemental braking system I most often recommend is the Blue Ox Patriot II # BRK2016. This proportional braking device will slow your F-150 at the same rate that the RV slows down, meaning less of the tug-of-war feeling from the toad. It also offers the exceptional convenience of wireless installation and it is fully portable to make it easy to move between vehicles. I have linked an installation video showing the Patriot in use in a Ford vehicle along with the written...
    view full answer...
  • Installation Video for SMI Air Force One Braking System for MHs with Air Brakes SM99243
    My contact at SMI Manufacturing advised that their Air Force One Supplemental Braking System for Motor Homes with Air Brakes, part # SM99243, will soon again have an enclosed installation video disc. Current production does NOT have the disc enclosed as SMI is in the process of preparing an updated installation video. We do have videos that we produced here at etrailer that show the installation process. I have linked those for you. One shows installation in a pickup, the other in a SUV.
    view full answer...
  • Installing SMI Air Force One Supplemental Braking System on 40 Foot Dutchcraft on Spartan Chassis
    When installing the SMI Air Force One Supplemental Braking System For Motor Homes with Air Brakes # SM99243 you will need to find the supply air line and the metered air line. On the Dutchcraft motor home on the Spartan Chassis the larger 5/8 inch line is the supply air line, and the smaller 3/8 inch line below the supply air line is the metered air line. I have attached a photo showing witch line is the supply and which line is the metered.
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  • Second Vehicle Kit Recommendation for SMI Air Force One for 2018 GMC Acadia
    What you are looking for is the second vehicle kit for the SMI Air Force One part # SM99209. This comes with everything you'll need and you'll be set. I attached an install video that shows this kit installed on a very similar 2017 Acadia for you to check out as well.
    view full answer...
  • Parts Needed to Flat Tow a 2010 Buick Enclave with a Motorhome with Air Brakes
    For your 2010 Buick Enclave I recommend using the Roadmaster EZ Crossbar Style Base Plate Kit # 523149-1 along with the Roadmaster Falcon 2 # RM-520 and the 6,000 lb coiled safety cables # RM-643. For a complete flat towing setup you will need a base plate kit, tow bar, safety cables, vehicle tow bar wiring, a supplemental braking system, and possibly a high-low adapter. I like recommending the Flexo-Coil Wiring Kit # RM-15267 because it allows you to also installed the Charge Line...
    view full answer...
  • Installation of SMI Air Force One Supplemental Braking System and Ease of Disconnect
    The SMI Air Force One Supplemental Braking System # SM99243 referenced in your question is confirmed to fit your Suzuki Grand Vitara and is a great choice if your RV has air brakes. This is a true, proportional system, which means it will actually use air pressure from the RV's brakes to apply the brakes in your towed vehicle at the same time and with the same intensity. The initial installation can definitely be a bit more involved than some other systems, but a great thing about this...
    view full answer...
  • SMI Tow Bar Braking System Recommendation for 2018 Ford Edge
    The Air Force One, part # SM99243, is a great braking system for motorhomes with air brakes. Other systems still work but this one prevents false braking when the coach's brake lights are activated with the exhaust brake. I attached an install video for this kit on a similar Ford Edge as yours for you to check out as well. For a base plate kit they'd need the part # BX2657 which is a confirmed fit for the 2018 Edge. For a tow bar the part # BX7365 would be a great option. For...
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  • Second Vehicle Kit Recommendation for Flat Towing with SMI Air Force One Braking Kit
    It does appear you have an air nozzle from a SMI Air Force One Supplemental Braking System # SM99243 which would mean that all you'd need further is the second vehicle kit part # SM99209 to install on the vehicle you plan to flat tow and you'd be set. You should trace the air line socket to make sure it looks like it goes to what I attached a picture of. In the picture is the portion of the Air Force One that mounts on the motorhome.
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  • Solution for SMI Air Force One that has Broken Cable from Air Cylinder
    If the cable of your SMI Air Force One kit broke from the cylinder then the only solution is going to be to replace the entire cylinder with the part # DM6210 as there isn't a way to reattach it.
    view full answer...
  • Recommended Supplemental Braking System to Flat Tow a Subaru Forester
    The brake controller you mentioned is utilized when towing a trailer or a tow dolly, but when you flat tow a vehicle a different system is used that will utilize your motorhome lights but will also utilize the braking inside your towed vehicle. For your Subaru Forester, I recommend the Air Force One, part # SM99243. It's great for motorhomes with air brakes like your Winnebago because it only engages the Subaru's brakes when the air brakes are activated and not when the brake lights...
    view full answer...

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