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FITS 2009 Jeep Compass
Demco SBS Air Force One Supplemental Braking System for Motor Homes with Air Brakes - Proportional

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

Item # SM99243
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Demco SBS Air Force One Supplemental Braking System for Motor Homes with Air Brakes - Proportional Proportional System SM99243
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Demco tow bar braking systems for your 2009 Jeep Compass are available from etrailer.com. Installation instructions and reviews for your Jeep tow bar braking systems. Expert service, and cheapest tow bar braking systems price guarantee. etrailer.com carries a complete line of Demco products. Order your Demco SBS Air Force One Supplemental Braking System for Motor Homes with Air Brakes - Proportional part number SM99243 online at etrailer.com or call 800-298-8924 for expert service.
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2009 Jeep Compass - Demco SBS Air Force One Supplemental Braking System for Motor Homes with Air Brakes - Proportional

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

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.

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

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 Demco SMI Air Force One Braking System Review

Hi, there, Rvers. Today we're going to be taking a look at Demco's Air Force One supplemental braking system. You've got your nice new motorhome and you're wanting to take your vehicle along with you. You have probably already looked into installing base plates and other components, but you have a big decision to make on which braking system you're going to want to put in your vehicle.There's a few things you're going to want to consider when deciding on the appropriate braking system. One of the biggest factors is your motorhome. If your motorhome has air brakes, then you want to choose the appropriate braking system that corresponds with that, and the Air Force One is one of the best systems out there for motorhomes that have air brakes.Most places that you travel will require that you have a braking system installed on your vehicle when flat towing it.

With the Air Force One installed, you'll have the peace of mind knowing that you're going to be legal where you travel and you're also going to be keeping your family safe.This system takes advantage of the fact that your vehicle already has brakes on it. It applies the brake pedal in the vehicle when it receives an input from your motorhome. You'll see it operating here. This is a truly proportional braking system. What that means is that when you apply the brake pedal in your motorhome, it applies the brake pedal in your vehicle with the same pressure and intensity.Now there are many advantages of having a proportional braking system.

For example, if you apply the brakes in your motorhome and you panic stop there, you'll also panic stop back here on your vehicle, ensuring that you help come to a complete stop quickly. Some other advantages are the way that it's going to feel when pulling your vehicle behind your motorhome.Proportional means that it's going to be equal inside as well as out here on the vehicle so the brakes back here aren't going to be applying too harshly, causing a tugging feel at the back of your motorhome, like you're dragging the vehicle. It's also not going to apply them too softly back here to where it feels like the vehicle is pushing the motorhome whenever you try to stop. It's going to be nice and even because they're both braking equally to one another.Since this braking system uses air pressure from the motorhome to determine how hard to apply the brake pedal in your towed vehicle, you don' have to worry about any false braking that can occur with an inertia sensor applied braking system. An inertia sensor applied braking system has an inertia sensor in the vehicle inside of its unit that checks inertia and applies the brake, depending on that inertia.Sometimes when coming to a stop, this inertia sensor can trigger falsely and apply the brakes too hard in your vehicle and you can feel that at the back of your motorhome, like you're pulling something.

What this means for you is it's not only going to feel better when pulling your vehicle in your motorhome. It's also not going to wear the brakes as fast as inertia sensor type braking systems on your towed vehicle.Since this braking system does run off of the air brake system on your RV, we're going to have components installed on both our motorhome and on our towed vehicle. On your RV, you're going to have your air tank and relay valve assembly. This is what's going to store air pressure and send the brake pressure signal back to your towed vehicle.When you apply the brakes in your motorhome, air is exhausted out of the system. When that air is exhausted out, the springs on your brake assemblies apply the brakes.

This unit captures that air that's being exhausted and sends it back to your towed vehicle and then that can be measured and used to apply the brakes in your towed vehicle.The output of the relay valve goes to a quick connect coupler located at the back of the motorhome. This is where we'll make our connection with our airline hose between our motorhome and our vehicle. Likewise, on the vehicle, you're going to have a quick connect coupler as well to make that connection between the motorhome and the vehicle. The air is then directed through the coupler in the front up to our operating unit that's installed in the vehicle. The operating unit monitors that air input and uses it to apply the brakes inside the vehicle.Inside of our vehicle, we have our operating cylinder. This is attached to the output of the operating unit so air comes down our hose here and applies the cylinder, pulling our pedal towards the firewall, depressing it, applying the brakes. The operating unit is also tapped into the brake booster's vacuum line so that way, it pulls vacuum on the brake booster, ensuring you have power brakes when applying the pedal. This will ensure that it's applying the brakes hard enough for it to stop under those panic conditions.What this means for you is that your towed vehicle is going to have power brakes at all times, just like when you we're driving it. Now you might be wondering, "Well, what if my vehicle doesn't use vacuum for its brakes, such as hydro boost systems" There is a small kit of components that does come included with the system in case you don't have a vacuum assisted brake booster, you have a hydro boost system, that you'll install to keep it compatible with those as well.Now while it's never fun to think about, in the event of a catastrophic disconnect between your motorhome and your towed vehicle, there is a breakaway switch that is included with your system, that when installed, will have a cable attached between the switch and the motorhome. When it is disconnected, the switch will get pulled just like this and the brakes will be applied inside your vehicle, helping it come to a safe stop.For peace of mind, there is an LED indicator installed on the back of the mirror that will illuminate when your system is applying the brakes in your vehicle. This way you know your system is operating properly when driving down the road. This can typically be seen in your rear view camera on your motorhome.One of my favorite things about this system is that once it is installed, you don't have to do anything else and it's hidden inside the vehicle so you don't even really know that it's there. When you're taking your kids to soccer practice, you don't have to think about your braking system, but it's there when you need it so you can take your vehicle with you on your adventure.With your vehicle along for the ride, you don't have to be worried about being stuck at the campsite, having to take your RV on those supply runs. You can just quickly disconnect, hop in your vehicle and go, or you could burn rubber when Aunt Kathy starts talking about her cats again.Compared to portable systems, like Blue Ox's Patriot, the Air Force One is going to always be ready on your vehicle when you need it whereas the Patriot will have to be installed every time you want to use it and whenever you want to drive your vehicle, you have to take it back out. While that's not an extremely long, time-consuming process, with the Air Force One, you don't have to worry about any of that.That being said, if you do have more than one vehicle with the base plate installed, the Patriot is a pretty good option to get a supplemental braking system on both of those vehicles at a lower cost. You will need a few additional components for a complete flat tow setup. You'll need the base plate installed on your vehicle. You'll need your tow bar to make the connection between your base plate and your vehicle and the motorhome. You'll need diode wiring to transfer the lighting signals from your motorhome to your vehicle. You will also need safety cables and a supplemental braking system, like our Air Force One.That completes our look at Demco's Air Force One supplemental braking system.

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   (77 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

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
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
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
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

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
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
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
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
2018 Ford Focus

been working to put it on for two days now the video on etrailer for a 2018 Ford Focus is not that good been looking at a video of a 2014 Honda CRV to do most of what we have done will be calling tomorrow and see if they can answer or have a better video that can help only like two things 792071

- SM99243

I installed it myself but because I rode my leg I have not had a chance to us it sorry I can't tell you anymore about it at this time. Thank you Curtis Murphy 791367

- SM99243
GMC Sierra

Great product.. a must if you flat tow a vehicle like my GMC Sierra truck that requires you to disconnect the battery when you tow it. Push a button and the battery is disconnected, push it again and its reconnected.. it's that simple to disconnect the battery. 790601

- SM99243
2004 GMC Envoy

Great customer service and rapid shipment Thank You 784546

- SM99243

Installation went smooth, breaking work great. Easy to hookup our jeep for flat towing 783420

- SM99243

Absolutely the best. Works beautifully, and product Quality is very good. Look forward to buying many other RV items. regards 771363

- SM99243

The braking system took more time to install but is so easy to use. Well worth the investment if your coach has air brakes. 765501

- SM99243

By using the air brakes on the tow vehicle, there is only one hose to hook up the brakes (along with the normal wiring lines & safety cables). 759020

- SM99243
2019 Ford F-250 Super Duty

2nd kit we have installed, very impressed with the quality and ease of installation 756557

- SM99243

Overall I am very pleased with this product. It operates well and is easy to hook and unhook the towed vehicle. I gave this 5 stars because of its operation, but do-it yourselfers be cautious, installation is a bit complicated and would be a challenge for most. I have been a truck technician for 30+ years and understand air brake systems well, so it was not a big deal for me, but I could see some struggle. It is really geared for professional installation. There are modifications necessary to both the tow and towed vehicles, and an incorrect line selection or wire could affect the operation of either unit. The kit is very complete, I only had to buy one fitting and a couple wire ends to adapt to my units. This was installed on a 2017 Entegra Insignia and 2013 Jeep Wrangler Unlimited. 753784

- 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

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

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Ask the Experts about this Demco Tow Bar Braking Systems

  • 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.
    view full answer...
  • 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...
    view full answer...
  • 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...
    view full answer...
  • 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 # BX7380 which includes...
    view full answer...
  • Does Demco SBS Air Force One Coiled Air Jumper Kit for Spartan Chassis also Fit K2 Chassis
    Yes, the Demco SBS Air Force One Coiled Air Jumper Kit for Spartan Chassis # SM6296 is the correct kit to use with the SMI Second Vehicle Kit for Air Force One Supplemental Braking Systems part # SM99209 and # SM99243 that you referenced for the Spartan K2 chassis.
    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....
    view full answer...
  • 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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  • 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.
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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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  • 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.
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  • Does LED Indicator Light of SMI Air Force One Light Up When Vehicle isn't Connected
    The LED notification strip that typically attaches to the rearview mirror of the vehicle being flat towed will not always light up when the vehicle brakes are applied. It would have to be connected to the tow vehicle. I attached a diagram for how it wires up as well.
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  • 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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  • 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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  • 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 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 #...
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  • Air Force One Breakaway Not Working on my 2014 Honda CR-V
    When the breakaway switch will not activate the air cylinder to apply the brake pedal on the SMI Air Force One # SM99243, the first thing to check is the inline fuse at the towed vehicles battery. If it is blown it will have to be replaced. If the fuse is good the next thing to check is that the air lines and check valves are properly installed. If the airline in is routed to the out and the out is routed to the in, the system will work when attached to the coach but the breakaway system...
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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.
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  • 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.
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  • 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...
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  • Is Air Force One Supplemental Braking System Compatible with Air over Hydraulic Motorhome Brakes
    Yes, the Air Force One part # SM99243 that you referenced is compatible with air over hydraulic brakes like what your 2003 Safari Cheetah has that is built on a Roadmaster M4R Series Chassis. I attached a review video for this system for you to check out as well.
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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...
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  • Parts Needed to Flat Tow a 2018 Subaru Forester
    The SMI Air Force One # SM99243 is a great braking system to use on your 2018 Subaru Forester as long as your motorhome has air brakes. This kit includes an LED coach notification system that lets you know when the brakes in your tow vehicle are being applied, but it will not activate the lights on your Forester, you will need a separate kit for that. For a complete flat towing setup you will need a supplemental braking system (the Air Force One), a base plate kit, tow bar, safety cables,...
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  • Troubleshooting Light Indicator of SMI Air Force One that Stays on All the Time
    The switch on the actuator for the Air Force One # SM99243 is a reed switch. It detects the presence of a magnet on the inner part of the actuator. When the magnet is near the switch the light is off. If you removed the reed switch and used a magnet you could simulate the activation and determine if the problem is the switch or the actuator. You also should try moving the switch on the actuator as it may need adjustment. If possible move the switch away from the air line as much as you can.
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  • Troubleshooting SMI Air Force One Braking System Triggering Check Engine Light on Toyota Corolla
    I reached out to my contact at SMI (now Demco) and he said that on your 2017 Toyota Corolla iM the exhaust port on the Air Force One # SM99243 operating unit does need to be left open. He said the issue in your case is that the vacuum check valve between the tee and operating unit has likely failed. You can simply replace this vacuum check valve with part # SM99909 and face the black portion of the valve towards the unit, making sure to unplug the exhaust port in the process. This...
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  • 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.
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  • 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.
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  • Parts Needed to Flat Tow 2016 Ford Fiesta Titanium Behind a Motorhome
    We can help you with the process of researching your options in flat towing equipment for when you're ready to tow your 2016 Ford Fiesta Titanium behind a yet-to-be-acquired motorhome. We have a comprehensive article on flat towing (plus a few others concerning specific towing items) that you can review for background and to show you the options. There are indeed many options when it comes to braking systems and wiring/lighting kits and these vary considerably in price and in how invasive...
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  • 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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  • 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...
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