Demco Hydraulic Brake Actuator w/ Lockout - Disc - Primed - A-Frame - 8" Channel Center - 12.5K

Demco Hydraulic Brake Actuator w/ Lockout - Disc - Primed - A-Frame - 8" Channel Center - 12.5K

Item # DM8105422

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Brake Actuator

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DM8105422 - Electric Lockout Demco Brake Actuator
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Surge-type actuator has a corrosion-resistant composite master cylinder. Electric lockout keeps brakes from actuating when in reverse. Mount coupler attachments (sold separately) in 1 of 3 positions. Welds onto a 50-degree A-frame trailer. Call 800-298-8924 to order Demco brake actuator part number DM8105422 or order online at etrailer.com. Free expert support on all Demco products. Guaranteed Lowest Price and Fastest Shipping for Demco Hydraulic Brake Actuator w/ Lockout - Disc - Primed - A-Frame - 8" Channel Center - 12.5K. Brake Actuator reviews from real customers.
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  • Reviews (2)
  • Q & A (4)
  • Videos (1)
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Demco Brake Actuator - DM8105422

  • Surge Brake Actuator
  • Disc Brakes
  • Channel Only
  • 12500 lbs GTW
  • Demco
  • Weld-On
  • Electric Lockout
  • A-Frame Coupler

Surge-type actuator has a corrosion-resistant composite master cylinder. Electric lockout keeps brakes from actuating when in reverse. Mount coupler attachments (sold separately) in 1 of 3 positions. Welds onto a 50-degree A-frame trailer.


Features:

  • Hydraulic actuator activates trailer's brakes when tow vehicle slows or stops
  • Electric reverse lockout lets you back up without actuating trailer brakes
    • Solenoid activates automatically when you shift into reverse
  • Adjustable channel has 3 different mounting positions for coupler (sold separately)
  • Composite master cylinder is durable and efficient
    • Glass-reinforced nylon construction resists rust and corrosion
    • Large reservoir provides increased capacity for brake fluid
    • Automotive-style diaphragm cap creates completely enclosed system to help prevent contamination of fluid
  • Acetal copolymer lining provides smooth operation as actuator telescopes in and out
  • Breakaway included
  • Heavy-duty steel construction
  • Primed finish
  • Weld-on installation
  • Made in the USA


Specs:

  • Application: 50-degree A-frame trailers with hydraulic disc brakes
  • Gross towing weight: 12,500 lbs
  • Maximum tongue weight: 1,250 lbs
  • Channel width: approximately 3"
  • Channel height: 8"
  • Model number: DA10
  • 1-Year warranty


When you apply the brakes in your tow vehicle, deceleration occurs and momentum pushes your trailer toward the rear of your vehicle. With surge brake systems, the hydraulic actuator is triggered as your trailer moves forward, once your tow vehicle starts to slow down. When this happens, the actuator contracts, applying force to its master cylinder. This in turn supplies the necessary hydraulic pressure to engage your trailer's brakes.


Electric Reverse Lockout

The electric reverse lockout on this trailer brake actuator is automatically activated when you shift your tow vehicle into reverse. The solenoid wires into your trailer connector - which connects to your tow vehicle - so that it can detect when you are in reverse. When your vehicle is in reverse, the solenoid ensures that the hydraulic actuator does not activate your trailer's brakes, thus allowing you to back up your rig. To use the lockout feature, you must have a 5-pole flat, 6-way round, or 7-pole trailer connector.


Adjustable Channel Design

The adjustable channel on this trailer brake actuator allows for ultimate versatility. Mount almost any type of coupler (sold separately) - from a standard ball coupler to a lunette ring or clevis attachment - to fit your specific application. In addition, the 3 mounting positions on the channel let you adjust the height of the coupler. Just place the coupler so that it matches the height of the ball mount or other hitch attachment on your tow vehicle and you will be able to tow your trailer levelly.



8105422 Demco DA10 Hydraulic Trailer Brake Actuator for Disc Brakes - A-Frame - Adjustable Channel Center - 12,500 lbs



DM8105422 Installation InstructionsInstallation Details DM8105422 Installation instructions



Video of Demco Hydraulic Brake Actuator w/ Lockout - Disc - Primed - A-Frame - 8" Channel Center - 12.5K


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




Video Transcript for Demco Brake Actuator - Surge Brake Actuator - DM8105422 Review

Today, we're going to take a look at the Demco A-Frame Hydraulic Brake Actuator with the Reverse Lockout for this brakes, has a 12,500 lbs weight capacity. Now, this hydraulic surge-type actuator will activate your trailer brakes when the tow vehicle slows or stops. If you notice, on the front here, it has an adjustable channel with 3 different mounting positions for your coupler. Now, the couplers we do sell separately, if you need one. You can mount almost any type of coupler in here, from the standard ball coupler, to a lunette ring or a clevis attachment to fit your specific application. If you notice on the back, it has the electrical reverse lockout: This will let you back up without actuating your trailer brakes.

Basically, they put a solenoid into the master cylinder and this'll activate automatically when you shift into reverse. If you'll notice it has the 2-wire connection on it. One wire will go to your reverse light connect circuit, and the other will be to the ground. If you notice, it does have a nice, sturdy solenoid cover to protect it from any damage. Now, the master cylinder that the solenoid screws into is very durable and efficient. It's a glass-reinforced nylon construction, helps resist rust and corrosion, has a very large reservoir to provide increased capacity for the brake fluid, and if you notice up at the top here, they do use an automotive style diaphragm cap, which will create a completely enclosed system to help prevent contamination of your brake fluid. As I spin this around, the actuator portion slides in and out.

If you notice, on the inside right here, they have an acetal copolymer lining, and this will help provide a nice smooth operation as your actuator telescopes in and out. The breakaway, right up here, is all-included. This is a nice, heavy duty steel construction, has a nice primed finish. It is a weld-on insulation, and it is made in the USA. Again, the application for this, you can see, is a 50-degree A-frame trailer, and it is designed to use on trailers that have hydraulic disc brakes.

Gross towing weight capacity is 12,500 lbs. Maximum tongue weight capacity is 1,250 lbs. The model number on this is DM810 00:02:01, and I do want to give you the measurements on the channel itself. The overall height of it, from the very bottom to the top, is right at 8". The holes, if you measure center-to-center, are going to be right at 2", center-to-center, and the channel width, the inside width on it, is going to be right at 3". I think that should do it for the review of the Demco A-Frame Hydraulic Brake Actuator with the Reverse Lockout for this brake, and a 12,500 lbs weight capacity..


Customer Reviews

Demco Hydraulic Brake Actuator w/ Lockout - Disc - Primed - A-Frame - 8" Channel Center - 12.5K - DM8105422

Average Customer Rating:  4.5 out of 5 stars   (2 Customer Reviews)

Surge-type actuator has a corrosion-resistant composite master cylinder. Electric lockout keeps brakes from actuating when in reverse. Mount coupler attachments (sold separately) in 1 of 3 positions. Welds onto a 50-degree A-frame trailer.

- DM8105422
by:

Very well make Surge Brake Hitch. Excellent quality. etrailer always has what you need at a good price. Excellent company. 680929



- DM8105422
by:

Arrived in good condition, although box was in bad shape. Just got it and disassembled to fit up and weld on 1978 Airstream 31' Excello 500. Will have to reposition jack and possibly propane tank mounts. This trailer originally had a vacuum brake booster. will update when installed. 335504


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Ask the Experts about this Demco Brake Actuator

Do you have a question about this Brake Actuator?


  • Surge Coupler for A-Frame Trailer with Disc Brakes
  • We do offer two disc brake surge coupler/actuators that will fit a standard 50-degree a-frame trailer. Both of these actuators come from Demco. Actuator # DM8105422 is primed red and intended for weld-on installation. It includes a breakaway and an electric reverse lockout feature that can be activated by the tow vehicle's reverse light circuit to allow you to back up the trailer with engaging the brakes. This unit has a tongue weight rating of 1250-lbs and a gross towing weight rating...
    view full answer...

  • Troubleshooting Reverse Lock Out Solenoid of Surge Brake Trailer Not Functioning
  • The issue is definitely related to the wiring of the reverse lockout solenoid since you have replaced it and still have the same issue. First thing I would check is the pins of your trailer wiring connectors. Most likely there is some corrosion or dirt on the pins of the reverse light circuit which can be cleaned off with some sandpaper to improve the contact which will allow the circuit to have a more solid connection and activate the solenoid. Another thing I would try is using a probe...
    view full answer...

  • Availability of 12.5k Rated A-Frame Surge Brake Coupler
  • Yes we have the Demco # DM8102222 for if you have drum brakes or the part # DM8105422 for if you have disc. These have channels on the front so you would need the ball coupler part # DM05557-97 to connect to a 2-5/16 inch hitch ball.
    view full answer...

  • Best A-Frame Disc Brake Trailer Coupler Actuator
  • I do have an option for you but there is not a version of the Titan Zinc-Plated A-Frame Brake Actuator part # T2492800 that is rated for use on trailers with disc brakes. The only a-frame trailer coupler we do offer for use with disc brakes is the Demco Hydraulic Brake Actuator w/ Lockout part # DM8105422 therefore this is what I recommend you use. In order to use this coupler with a 2" hitch ball you will also need the Demco Trailer Coupler part # DM07678-97. The Demco coupler will...
    view full answer...


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Info for this part was:

Written by:
Lindsey S
Installed by:
Jeff D
Expert Research:
Jameson C
Expert Research:
Adam R
Updated by:
Laura H

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