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Reverse Lockout Solenoid for Demco Hydraulic Brake Actuators - Non-Bypass

Reverse Lockout Solenoid for Demco Hydraulic Brake Actuators - Non-Bypass

Item # DM11993
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Replaces or adds an inline reverse lockout solenoid to Demco DA10, DA20, and DA91 hydraulic trailer brake actuators. Non-bypass design allows you to thread the solenoid valve into your master cylinder for a hassle-free installation. 1-636-306-4830 to order Demco accessories and parts part number DM11993 or order online at Free expert support on all Demco products. Guaranteed Lowest Price and Fastest Shipping for Reverse Lockout Solenoid for Demco Hydraulic Brake Actuators - Non-Bypass. Accessories and Parts reviews from real customers.
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Demco Accessories and Parts - DM11993

  • Brake Actuator
  • Solenoid Parts
  • Solenoid Kits
  • Demco

Replaces or adds an inline reverse lockout solenoid to Demco DA10, DA20, and DA91 hydraulic trailer brake actuators. Non-bypass design allows you to thread the solenoid valve into your master cylinder for a hassle-free installation.


  • Solenoid allows you to replace or add a reverse lockout solenoid to your Demco hydraulic trailer brake actuator
    • Allows you to move in reverse without engaging the trailer brakes
    • Made in the USA
  • Fits Demco models DA10, DA20, and DA91 hydraulic trailer brake actuators
  • Non-bypass configuration
    • Allows you to install the solenoid without drilling into your master cylinder
    • Easier to install than bypass models
    • Made in the USA
  • Made in the USA

11993 Demco Reverse Lockout In-Line Solenoid for DA10, DA20, and DA91 Hydraulic Brake Actuators - Non-Bypass

Video of Reverse Lockout Solenoid for Demco Hydraulic Brake Actuators - Non-Bypass

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

Video Transcript for Demco Hydraulic Brake Actuator Reverse Lockout Solenoid Installation

Today on our boat trailer we will be installing a reverse lock out solenoid for hydraulic brake actuators. It is part number DM11993. We're also going to be using Titan Master Cylinder Assembly part number T4749501042. Here's our master cylinder for a reverse lockout solenoid already screwed into it. Your master cylinder will have a fitting like this in the back of it. You just unscrew that and you can screw your solenoid in for the reverse lockout.

Let's show you how to install the master cylinder real quick. We'll just slide it into the tongue of our trailer like so making sure the push rod slides into the channel of the tongue. Then we'll grab our bolts here. There's two on either side that it bolts to. We'll have to push in on our master cylinder a little bit in order to line up the bolt holes. Okay, now we have these two started on this side, we'll do the other side the same way.

Once we have all four bolts started we can tighten them down. Now we can take our brake line and secure it into our lockout solenoid here and we'll tuck up the excess brake hose underneath the trailer in the channel. We'll tighten upper fitting going into the lockout solenoid for our long brake hose going back to our T fitting and we'll secure our excess down. These wires coming out off the lockout solenoid, we'll ground one of them to the trailer frame and the other one will go to the reverse wire signal from our trailer input on the electrical connector. I'll take one of the wires, strip off about a quarter inch or so and then we'll take a ring terminal here and crimp it on. Then we use this one as our ground wire and we'll ground it to the frame of the trailer.

To do that we'll use a self-tapping screw right here and we'll just find a place on the frame to ground it to. We've got our self-tapping screw, screw gun. I'll take our other wire here that we'll hook up to the reverse input of our trailer. Chip off a quarter inch. Take a weather proof plug connector here. Insert it and we'll crimp it down as well.

The other end will go to our five pole or our seven pole, whichever we're using and this will be the input for the reverse signal. We're going to convert our trailer over to a five point signal here. Five flat. This is made for boat trailers. The five pole flat connector that we're using here for easier installation for the trailer wiring is 20017. We have the blue wire here which is the signal for reverse for your trailer brake lock out solenoid. We'll strip off a quarter inch of the blue wire here. We'll install it into our plug connector that goes to our solenoid. We'll crimp it into place. We can hook up the rest of our wires to where they go based upon our connection here. Take our old connection here and cut off these zip ties to separate our wires so we can access them a little bit easier. Now we're going to start with our green wire. Strip back about a quarter of an inch. We're measuring off where we need to trim back our green wire. Right about there. We'll cut the excess off of our green wire. Strip back about a quarter of an inch. Install our butt connectors. Now we'll take the brown wire for our right side and we'll do that one next and we'll do the same for the other wires. Okay, with all of our electrical connections made now we can use our heat source to seal our heat shrink butt connectors up. To help tidy up our wires I'm going to take some electrical tape here and wrap around our wires. Just so we don't have a lot hanging down and this will make a nice clean install. Now that we've done that we can fill our master solenoid with some fresh clean brake fluid from an unopened container. Fill it up. Re-secure the cap like so. We can open up the brake bleeder on the passenger because it's the furthest from the master cylinder. We're going to use the top one. You always use the top brake bleeder. I'll open this up a little bit using a seven sixteenth wrench. Now we can start bleeding our brakes. You can take your safety chain here and give you a place to rest a two by four or metal pipe along and you can push the tongue of the trailer back into the master cylinder and we can begin the bleeding process. By pushing back on the tongue like so and we'll just keep on doing this process until we have no air bubbles coming out of the bleeder screw on either caliper. Now that we've had a steady stream of fluid coming out of the passenger side bleeder screw here on the top we'll do the same on the driver's side and once we have a steady stream of fluid coming out of that one as well we'll top off our brake fluid in the master cylinder and we will check the system for any leaks at any other connection points where our hoses meet and if no leaks are found our hydraulic portion of the brake system is done. We can go ahead and put our wheels back on at this point in time. Now that we have completely bled our brakes and checked for any leaks that completes the installation of a reverse lock out solenoid for hydraulic brake actuators. It is part number DM11993.

Customer Reviews

Reverse Lockout Solenoid for Demco Hydraulic Brake Actuators - Non-Bypass - DM11993

Average Customer Rating:  5.0 out of 5 stars   (20 Customer Reviews)

Replaces or adds an inline reverse lockout solenoid to Demco DA10, DA20, and DA91 hydraulic trailer brake actuators. Non-bypass design allows you to thread the solenoid valve into your master cylinder for a hassle-free installation.


We have ordered a couple parts from here now and we have nothing but good things to say. One of the first things that we ordered was a trailer tongue and the box it was in was damaged during transit. We also noticed that the brake line was damaged. I called and spoke with customer service and they were very helpful and quick to get me a replacement part. Their communication with customers is amazing. We will defiantly be using them for future ordering.


Thanks!! What a great experience with Trailer needed many parts, rusted, broken etc. Tried to contact maker of trailer for replacement parts, bad experience. Rude, unwilling to help, handling fees, VERY expensive shipping, and cash up front. I then turned to! Fantastic people on the line, sales personal were Kind, patient, and very knowledgeable about all my trailer needs. My parts arrived quickly, free shipping, and accurate. Not to mention I saved a bunch of money!!!! New Break System from front to back, new Trailer Winch. Thanks, Customer for life!


It worked as expected. I paired it with a new surge brake hitch. I can back my boat up a ramp into the storage shed with ease. No more getting out and manually locking out the hydraulic brakes.


Perfect Replacement for my Crownline boat trailer. Welded right on and weather breaks. Works great!


Friendly on the phone. Shipped when said they would. Was delivered as promised.


Easy to install and everything works excellent! Would recommend it for anyone in need of one!


Received the parts i ordered on time. The master cylinder (model 20) was an exact fit to the original on my myco boat trailer. I look forward to doing future business!! [Thumbs up]


Great valve


Easy to install and worked as designed


Fits and works exactly as described. Easy install.



Good part


not installed yet


Exelent, it fits perfect and it works good too.


Works as advertised...








See what our Experts say about this Demco Accessories and Parts

  • Reverse Lockout Solenoid for a Demco DA66B Brake Actuator
    I spoke with Demco and they informed me that the Reverse Lockout Solenoid for Demco Hydraulic Brake Actuators part # DM11993 will work with a Demco DA66B Brake Actuator.
    view full answer...
  • Surge Brake Actuator Recommendation for 2004 Trailmaster with Reverse Lock Out
    The Demco Actuator part # DM8608601 that you referenced does not come with a reverse lockout but you can add one with the # DM11993. When this is wired up and activated it basically prevents the brakes of your trailer from activating so that you can backup without any issues.
    view full answer...
  • Can Reverse Lock Out Solenoid be Added to Demco Surge Actuator # DM8608601
    Yes, you can add a reverse lockout to the Demco surge actuator # DM8608601 with the # DM11993 and you'd be set.
    view full answer...
  • Installing Reverse Lockout Solenoid To Stop Brakes n Trailer When Going Downhill With Motorhome
    The reverse lockout solenoids stop brake fluid from being released from the master cylinder and sent to the wheel cylinder. It does this by receiving an electric signal, usually from the reverse light circuit. That said, if you were to wire this into a circuit on the motorhome active when braking downhill then I do think it is entirely possibly to stop the brakes from being applied while going down hill. The reverse lockout solenoids are universal in design so you can use the Reverse Lockout...
    view full answer...
  • Troubleshooting a Reverse Lockout Solenoid Not Operating Correctly
    I do have an option for you. From what you are describing your reverse lockout solenoid is not operating correctly. The reverse lockout solenoid should completely close when energized to prevent brake fluid from getting through to activate the brakes. The combination of age, presence of grime and that you can blow air through when energized tells me that it is time for a replacement. - Reverse Lockout Solenoid for Demco Hydraulic Brake Actuators # DM11993
    view full answer...
  • Electronic Lock Out Recommendation for Demco Actuator with Manual Lock Out
    Yes, if you wanted to install an electric reverse lockout on the Demco actuator part # DM8102222 you would want the part # DM11993. This is confirmed to fit DA10 actuators like this. When this solenoid has power on it would prevent hydraulic pressure from building in your brake lines and assemblies.
    view full answer...
  • Reverse Lock Out Solenoid Recommendation for DA10 Actuator
    If you wanted to install an electric reverse lockout on the DA10 Demco actuator part # DM8102222 you would want the part # DM11993. This is confirmed to fit DA10 actuators like this. When this solenoid has power on it would prevent hydraulic pressure from building in your brake lines and assemblies.
    view full answer...
  • Will Demco Reverse Lockout Solenoid Fit a UFP Actuator
    You could get the Demco lockout solenoid # DM5404 to fit the UFP coupler. But as far as whether or not it is the right type of solenoid is what you need to look at. This one is designed to route brake fluid back into the master cylinder via a second port in the master cylinder. If that is what your UFP has then you could use this solenoid just keep in mind that it has not been tested with other brands. If your actuator does not use the bypass type of solenoid then you would use one like...
    view full answer...
  • Demco Surge Brake Actuator Recommendation for Drum Brakes with Trigger Latch
    We have just what you are looking for. For a surge actuator designed for drum brakes by Demco we have the part # DM72VR which has a 7,000 lb capacity. Then to add an electric reverse lock out all you'd need then too is the part # DM11993 and you'd be set. The coupler has a trigger style of latch and is designed for a 2 inch hitch ball. I attached an install video for this coupler for you to check out as well.
    view full answer...
  • Reverse Lockout to Use with Demco Surge Actuator DA70
    You could use the Demco reverse lockout part # DM11993 with the Demco surge actuator part # DM72VR.
    view full answer...
  • Is There a Hydraulic Drum Brake Actuator With Electric Reverse Lockout & 2 Inch Ball Coupler
    While the Dexter option you mentioned is for disc brakes only, there is a way to get a similar hydraulic drum brake actuator with an electric reverse lockout. You'll need to get the actuator and lockout separately, so what you can use is the following: - Demco Hydraulic Brake Actuator - Drum - Zinc - 2" Ball - 7,000 lbs # DM72VR - Reverse Lockout Solenoid for Demco Hydraulic Brake Actuators - Non-Bypass # DM11993 I have added a link below to an install vide of the lockout solenoid for...
    view full answer...
  • Can Demco Disc Brake Actuator w/ Lockout & 20,000 lb Capacity Work w/ Drum Brakes
    Disc brake actuators like the Demco Hydraulic Brake Actuator w/ Drop and Electric Lockout - Disc - Zinc - 2-5/16" Ball - 20K # DM8204311 cannot be used with drum brakes because disc brake actuators use much higher pressure, so they could blow out the wheel cylinders, among other issues. That said, you can add a lockout to the drum brake version of this actuator: - Demco Hydraulic Brake Actuator w/ Drop - Drum - Zinc - 2-5/16" Ball - 20,000 lbs # DM8204011 - Reverse Lockout Solenoid for...
    view full answer...
  • Is Manual Reverse Lockout as Effective as Solenoid For Demco Actuator A91
    There isn't an angle I can give you for when the lockout would be needed; however, if you want to be able to back up as needed you will need a reverse lockout with the Demco Hydraulic Brake Actuator # DM8609502. That said, the Manual Reverse Lockout Kit for Demco Hydraulic Trailer Brake Actuators # DM5939 is absolutely just as effective as the Reverse Lockout Solenoid for Demco Hydraulic Brake Actuators - Non-Bypass # DM11993. The trade-off being the manual lockout just isn't as convenient...
    view full answer...
  • Do Both Pigtail Leads on Reverse Lockout Solenoid Have to Be Connected
    An electric reverse lockout solenoid like # T4748800 from Titan and # DM11993 from Demco does have two pigtail leads. These leads are non-polarized, so either wire can be used as ground or hot. We are not familiar with any single-wire self-grounding solenoids similar to these units. If there is not a strong enough ground to let full reverse light signal voltage reach the solenoid, then it is possible that it could engage only partially. This would explain why the brakes could still be...
    view full answer...
  • DA91 Demco Disc Brake Actuator for 2-5/16 Hitch Ball with Electric Lockout Needed
    The DA91 Demco surge brake actuator that you are looking for is part # DM8750311. This has a 2-5/16" coupler, comes with an electric lockout, is designed for disc brakes, and has a weight capacity of 8,000 lbs towing and 800 lbs tongue weight.
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    Image 1 for
  • Solution for Surge Trailer Brakes that Activate When Backing Trailer Up
    Surge brakes will activate when backing the trailer up unless you do one of two things to address the problem. You can install free-backing brake assemblies on the trailer (I attached a link to a page that has all of the ones we carry) or you can use a reverse lockout solenoid which will prevent hydraulic pressure from making it to the wheel cylinders when the reverse light circuit activates the solenoid. If you have a Titan actuator you would need the part # T4748800 or if you have...
    view full answer...
  • Installation of Reverse Wire Addition to 4-Way for 5-Way Trailer With Hydraulic Brakes
    For your Adapter 4-Pole to 5-Pole Trailer Wiring Adapter - Shorter # 47515 you will connect the blue wire to your reverse light power at the tail light. Use a circuit tester like # PTW2993 to find the power wire that only comes on when the vehicle is shifted in reverse. Don't trust wire color, just follow functions. Test all your 4-way functions as well to ensure everything is working correctly. If not, use the circuit tester to trace the wires. On the trailer side, that pin location...
    view full answer...
  • Is the Titan Reverse Lockout Solenoid Compatible with Non-Metallic Master Cylinders?
    The Replacement Solenoid Valve for Titan Brake Actuators with Reverse Lockouts # T4748800 is compatible with a variety of master cylinders just like the Demco Reverse Lockout # DM11993. Either will work with a plastic master cylinder like the Demco # 5650. I recommend going with the Demco Solenoid because it is made to be a non-bypass solenoid so it seems to function a little better.
    view full answer...
  • Best Replacement Reverse Lockout Solenoid for Demco Hydraulic Brake Actuator # DM8509612
    We do have a replacement reverse lockout solenoid for the Demco Hydraulic Brake Actuator # DM8509612, but the Replacement Solenoid Valve # T4748800 that you referenced is not designed and has not been tested to fit the Demco actuators. Instead you will want part # DM11993 for just the solenoid or part # DM5837 for the kit that includes the solenoid cover. These are designed specifically for the Actuator # DM8509612. I have attached a link to an installation video of this solenoid for...
    view full answer...
  • Recommended Replacement for ATwood 84312 Drum Brake Actuating Coupler
    The Atwood 84132 was designed for use with drum brakes, so for a qualified replacement, you'll want something compatible with a 3 inch trailer tongue with a 6K capacity, accepts a 2 inch ball and provides an electric lockout. Demco doesn't offer an 'off the shelf' exact replacement with a electric reverse solenoid because most folks just use free-backing brakes, in which case the # DM72VR you mentioned would work just fine. If you do NOT have free backing brakes, you can indeed use the...
    view full answer...
  • What is the Difference Between a Manual Lockout and No Lockout Brake Actuator
    A brake actuator with a manual lockout, like part # T63FR, will have a lockout lever on the actuator that prevents the internal spring and shock from engaging the master cylinder when backing up (see photo). A no lockout brake actuator, like part # DM72VR, does not have this feature, so the trailer would either need free-backing brakes or an electric lockout solenoid like part # DM11993 to keep the brakes from locking up while in reverse. Backing up a trailer with hydraulic surge brakes...
    view full answer...
    Image 1 for
  • Solution for Reverse Lockout on Demco DA70 Actuator
    The # DM5939 is only compatible with the DA91 like the # DM8759131. Unfortunately, there is no option for manual lockout on a DA70 like the # # DM72VR. There are two ways you can keep your brakes from locking up with this brake actuator. The first is to add a solenoid like the # DM11993. The other option you have is to switch out the brakes on your trailer with free backing brakes like # AKFBBRK-35-D. These brakes won't engage in reverse so there would be no need to add a lockout to your...
    view full answer...
  • Surge Trailer Brakes Lock Up when Backing Up on Trailer with Electric Reverse Lockout
    If your 2006 Toyota 4Runner has a 7-Way then the center pin on it should be the reverse light circuit. To test it you will need one other person, a circuit tester such as # 40376, and the vehicle wheels will need to be chocked. Basically you will have the other person sit in the vehicle, start it up, apply the emergency brake, keep their foot on the brake, and put the vehicle in reverse while the wheels are chocked (safety first). Then you can use the circuit tester to test that center...
    view full answer...
  • Electric Solenoid for Demco Hydraulic Brake Actuator Channel Down
    Yes, you can install the Reverse Lockout Solenoid # DM11993 so that the Demco Hydraulic Brake Actuator # DM8759432 has an electric lockout. I confirmed this with my contact at Demco. Then for a 2" coupler I recommend the Demco Trailer Coupler # DM14976-52 since it has the eZ-Latch system, and for a lunette ring we have the 3" diameter options from Demco in the following colors: Black - # DM09557-81 Zinc (Silver) - # DM09557-95 Primed (same as the actuator) - # DM09557-97
    view full answer...

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