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  1. Brake Actuator
  2. Demco
  3. Surge Brake Actuator
  4. Drum Brakes
  5. Channel Only
  6. 8000 lbs GTW
Demco Hydraulic Brake Actuator - Drum - Primed - A-Frame - Adjustable Channel Center - 8,000 lbs

Demco Hydraulic Brake Actuator - Drum - Primed - A-Frame - Adjustable Channel Center - 8,000 lbs

Item # DM8759522
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Brake Actuator
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DM8759522 - Weld-On Demco Brake Actuator
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Surge-type actuator features a corrosion-resistant composite master cylinder and a primed finish. 8" Adjustable channel lets you mount different coupler attachments (sold separately) in 1 of 3 positions. Welds onto a 50-degree A-frame trailer. 1-800-940-8924 to order Demco brake actuator part number DM8759522 or order online at etrailer.com. Free expert support on all Demco products. Guaranteed Lowest Price and Fastest Shipping for Demco Hydraulic Brake Actuator - Drum - Primed - A-Frame - Adjustable Channel Center - 8,000 lbs. Brake Actuator reviews from real customers.
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Demco Brake Actuator - DM8759522

  • Surge Brake Actuator
  • Drum Brakes
  • Channel Only
  • 8000 lbs GTW
  • Weld-On
  • No Lockout
  • A-Frame Coupler
  • Demco

Surge-type actuator features a corrosion-resistant composite master cylinder and a primed finish. 8" Adjustable channel lets you mount different 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
  • 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 drum brakes
  • Gross towing weight: 8,000 lbs
  • Maximum tongue weight: 800 lbs
  • Channel width: approximately 3"
  • Channel height: 8"
  • Model number: DA91
  • 1-Year warranty


Note: Because this actuator does not include a reverse lockout, it is recommended that you equip your trailer with free-backing brakes so that you can drive in reverse without the actuator triggering your trailer's brakes.


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.


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.



8759522 Demco DA91 Hydraulic Trailer Brake Actuator for Drum Brakes - A-Frame - Channel Center - 8,000 lbs





Video of Demco Hydraulic Brake Actuator - Drum - Primed - A-Frame - Adjustable Channel Center - 8,000 lbs

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




Video Transcript for Review of Demco Brake Actuator - Surge Brake Actuator - DM8759522

Hello everybody this is Jeff with etrailer.com. Today we're gonna take a look at the Demco A-Frame Hydraulic Drum Brake Actuator, with the eight inch adjustable channel center position, with an 8,000 pound gross towing weight capacity. Now this actuator here is designed to fit a 50 degree, you see right here, A-frame trailer. And this hydraulic actuator will activate your trailer's brakes when the tow vehicle slows or stops. Basically what happens is when you apply the brakes in your tow vehicle deceleration occurs, and the momentum will push your trailer toward the rear of your vehicle. And with the surge brake system this actuator is then triggered as your trailer moves forward once your tow vehicle starts to slow down.

And when that happens this actuator will contract and apply force to the master cylinder which is located in the back here. And then this in turn supplies the necessary hydraulic pressure to engage your trailer's brakes. Now this actuator here uses on the inside an acetal copolymer lining that'll provide a nice, smooth operation as the actuator telescopes in and out. Up front you can see it has the adjustable channel offers three different mounting positions for your coupler. Now the coupler is not included, we do sell that separately on a website.

Just to give you a dimension on the channel itself the overall height of it; bottom to top is eight inches and the inside width on it is right at three inches wide. Now this is a heavy duty steel construction has a nice prime finish to it for better corrosion resistance. The very back here we mentioned the master cylinder, it is a composite master cylinder. It's very durable and efficient they use glass reinforced nylon construction that'll resist rust and corrosion, and it offers a very large reservoir which provides increased capacity for the brake fluid. You notice at the top here it does have an automotive styled diaphragm cap which will create a completely enclosed system, helps prevent contamination of the brake fluid.

It does include the breakaway cable with the hook and the latch, and this breakaway cable is required by law and the reason is it prevents a trailer runaway situation. So basically when you trailer hooks up to your tow vehicle what you'll do is take this hook with the latch on it and hook that also to the tow vehicle. So if that hook to the tow vehicle what would happen is if your trailer by chance would break loose from your tow vehicle it would pull on this cable, which would activate the lever and apply pressure in the master cylinder which would again, apply the brakes on your trailer. So this breakaway kit will prevent a trailer runaway situation. Now this is a well done installation.

As we mentioned before, you can see it's designed amount to a 50 degree A-Frame trailer, it is made in the USA and it is designed to work on trailers with the A-Frame and the hydraulic drum brakes, gross towing weight capacity on this is 8,000 pounds an actual tongue weight of 800 pounds. One last note I do wanna mention at the very back here because this actuator does not include a reverse lockout. It is recommended that you equip the trailer with either reverse lockout solenoid, which would screw into the back of the master cylinder here or to have free backing brakes on your trailer so that you could drive in reverse without the x-ray or triggering your trailer's brakes. But that should do it for the review on the Demco A-Frame Hydraulic Drum Brake Actuator with the eight inch adjustable channel in the center position at an 8,000 pound gross tongue weight capacity..


Customer Reviews

Demco Hydraulic Brake Actuator - Drum - Primed - A-Frame - Adjustable Channel Center - 8,000 lbs - DM8759522

Average Customer Rating:  5.0 out of 5 stars   (1 Customer Reviews)

Surge-type actuator features a corrosion-resistant composite master cylinder and a primed finish. 8" Adjustable channel lets you mount different coupler attachments (sold separately) in 1 of 3 positions. Welds onto a 50-degree A-frame trailer.

by:

Yes i recieved the device , I'ts better than i expexted , very well built , Can definetely handle more weight than designed for, P/S I invented the device about 45 years ago. The device takes the shifting weight away from the hitch and tong of the trailer. The first device used a coil spring, The device i recieved uses a shock works the same as a coil spring.



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See what our Experts say about this Demco Brake Actuator



  • Replacement for Old A-Frame Surge Brake Actuator
    I do have an option for you but I don't recommend stacking frame sections so you can bolt-on a new brake actuator. That said, it looks like you have an a-frame actuator and we have several options to replace this. The Demco Hydraulic Brake Actuator part # DM8759522 would be a great choice. It will require welding and painting. I have attached our full list of a-frame coupler options below.
    view full answer...
    Image 1 for
  • Replacement Actuator and Coupler for 2013 Jayco Jay Flight
    For the Jayco RD-19 you would use the Demco Hydraulic Brake Actuator - Drum - Primed - A-Frame - Adjustable Channel Center - 8,000 lbs # DM8759522 and then the Demco Trailer Coupler - Cast - Adjustable Channel - eZ-Latch - Black - 2-5/16" Ball - 21K # DM14040-81. Then use Hardware Kit for Demco Adjustable Channel Mount Couplers # DM6166.
    view full answer...

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Info for this part was:

Employee Leah B
Edited by:
Leah B
Employee Lindsey S
Written by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Laura H
Updated by:
Laura H

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