Demco Hydraulic Brake Actuator - Drum - Zinc - 8" Adjustable Channel Down - 8,000 lbs

Demco Hydraulic Brake Actuator - Drum - Zinc - 8" Adjustable Channel Down - 8,000 lbs

Item # DM8759131

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Brake Actuator

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Demco Surge Brake Actuator - DM8759131
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Surge actuator features a corrosion-resistant composite master cylinder and durable zinc plating, making it perfect for marine use. Adjustable down channel lets you mount coupler attachments (sold separately) in 1 of 3 positions. Bolt-on application. Call 800-298-8924 to order Demco brake actuator part number DM8759131 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 - Zinc - 8" Adjustable Channel Down - 8,000 lbs. Brake Actuator reviews from real customers.
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  • Reviews (3)
  • Q & A (4)
  • Videos (1)
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Demco Brake Actuator - DM8759131

  • Surge Brake Actuator
  • Drum Brakes
  • Channel Only
  • 8000 lbs GTW
  • Demco
  • Bolt-On
  • No Lockout
  • Straight Tongue Coupler

Surge actuator features a corrosion-resistant composite master cylinder and durable zinc plating, making it perfect for marine use. Adjustable down channel lets you mount coupler attachments (sold separately) in 1 of 3 positions. Bolt-on application.


Features:

  • Hydraulic actuator activates trailer's brakes when tow vehicle slows or stops
  • Adjustable channel has 3 different mounting positions for coupler (sold separately)
    • Channel-down design allows for greater drop
  • Zinc plating offers excellent corrosion resistance
    • 500-Hour salt spray rating - great for marine applications
  • 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
  • Bolt-on installation
    • Requires 1/2" x 4-1/2" Grade-5 bolts (not included) for mounting
  • Made in the USA


Specs:

  • Application: trailers with hydraulic drum brakes
  • Gross towing weight: 8,000 lbs
  • Maximum tongue weight: 800 lbs
  • Channel width: approximately 3"
  • Channel height: 8"
  • Mounting: straight, 3" wide trailer tongue
  • 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.


This actuator is great for tall trailers. This is because the adjustable channel is positioned so that the mounted coupler can sit below the actuator tube, allowing for a greater drop than with a standard center-mounted channel. As a result, you can line up your tall trailer with your tow vehicle's hitch for a level setup.


Sturdy, Corrosion-Resistant Construction

Made of sturdy steel, this hydraulic trailer brake actuator features a durable zinc coating that is designed to limit rust and corrosion. This zinc coat has a 500-hour salt spray rating, making the actuator perfect for marine use. In addition, the composite master cylinder is made of corrosion-resistant glass-reinforced nylon to further ensure durability for marine applications.



8759131 Demco DA91 Hydraulic Trailer Brake Actuator for Drum Brakes - Channel Down - 8,000 lbs







Video of Demco Hydraulic Brake Actuator - Drum - Zinc - 8" Adjustable Channel Down - 8,000 lbs


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 - DM8759131 Review

Today we're going to take a look at the Demco hydraulic drum brake actuator with the eight inch adjustable channel down position. It has an 8,000 pound weight capacity. This hydraulic actuator will activate your trailer brakes when your tow vehicle slows or stops. The adjustable channel right here the in the front will have three different mounting positions for the coupler that you attach. It is in the channel down position, which allows for a greater drop. Now, this does have a zinc plating, which will offer excellent corrosion resistance.

It goes through a 500 hour salt spray rating. It's great for marine applications. On the very back here, let me rotate this so you can see, right here underneath is the composite master cylinder, which is very durable and efficient. It's made of a glass reinforced nylon construction; it resists rust and corrosion. It has a large reservoir to help provide increased capacity for the brake fluid, and it uses up here on the top, an automotive style diaphragm cap, which will create a completely enclosed system to help prevent any contamination of the brake fluid.

On the inside of this, they do use an acetone copolymer lining to provide smooth operation, as this actuator will telescope in and out. The breakaway, right up here at the top you can see, is included. If you notice on the end here, they do use a snap hook on the safety cable, and that's to ensure a secure connection to the breakaway lever. It's made of a heavy duty steel construction with a sturdy reinforced outer casing. This is a bolt-on installation, you can see right down here at the bottom. Now it does require to use half inch by four and half inch grade five bolts for mounting this, and they are not included.

We do sell those separately. This part is made in the U.S.A. A few specs on this, the application is this is for trailers with hydraulic drum brakes, the gross towing weight capacity is 8,000 pounds, maximum tongue weight is 800 pounds. Now the channel width, let's turn this a little bit, the width of the channel inside dimension is going to be right at three inches. The channel height, which will be from the very bottom to the very top, is going to be right at eight inches.

This actuator is designed for mounting on a straight three inch wide trailer tongue, and the model number on this is DA91. One last note I want to mention on this actuator is 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 brakes. That should do it for the review on the Demco hydraulic drum brake actuator with the eight inch adjustable channel down position and an 8,000 pound weight capacity.


Customer Reviews

Demco Hydraulic Brake Actuator - Drum - Zinc - 8" Adjustable Channel Down - 8,000 lbs - DM8759131

Average Customer Rating:  5.0 out of 5 stars   (3 Customer Reviews)

Surge actuator features a corrosion-resistant composite master cylinder and durable zinc plating, making it perfect for marine use. Adjustable down channel lets you mount coupler attachments (sold separately) in 1 of 3 positions. Bolt-on application.

- DM8759131
by:

The product was as expected. Product aside, I was thoroughly impressed with the customer service from Kim. I placed the order online and Kim called me within a half hour to let me know there was a three to four week lead time, but she had an alternate part for me. She changed the order and called the next day to let me know the parts had shipped. Just excellent service! 468127



- DM8759131
by:

quick delivery. good service. good pr icing 337351



- DM8759131
by:

exactly what i needed and and it came in 2 business days. I dig it! 322384


3
3

Ask the Experts about this Demco Brake Actuator

Do you have a question about this Brake Actuator?


  • Recommended Replacement Coupler for Atwood 83000 Surge Brake Actuator Coupler
  • The Atwood 83000 was a 8,000 lb drum brake actuator for a 2 inch hitch ball that has been discontinued. For a replacement I recommend the Demco Hydraulic Brake Actuator w/ Drop - Drum - Zinc - 2" Ball - 8,000 lbs # DM8669112. The only other option for that 8,000 lb capacity is a channel mount like the Demco Hydraulic Brake Actuator - Drum - Zinc - 8" Adjustable Channel Down - 8,000 lbs # DM8759131 which will allow you to use a coupler like the Demco Trailer Coupler - Adjustable Channel...
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  • What are the Measurements of the Demco # DM8759131 Brake Actuator
  • I went to our warehouse to get the Demco brake actuator and provide you several measurements. The overall length is 23-3/4 inches and 5-3/4 inches from the channel to outer housing. The 3 center eye to eye measurements are 1.34 and 2-inches on the channel and each pin hole is .65 inches in diameter. The mounting flanges below the outer housing measurements are 3-inches from eye to eye on the mounting flange with 2 pin holes. Each of these mounting holes are .52 inches. I included a...
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  • Does Manual Reverse Lockout Kit for Demco Hydraulic Trailer Brake Actuators Work With DA91 Models?
  • I can confirm for you that the Manual Reverse Lockout Kit for Demco Hydraulic Trailer Brake Actuators # DM5939 will work with the Demco Hydraulic Brake Actuator # DM8759131. This actuator is model number DA91, as you said, and the lockout kit is designed for use with DA91 actuator.
    view full answer...

  • Does Master Cylinder of Actuator Need to be Bled when Replacing Actuator
  • You will still need to bleed your brake system when you install the part # DM8759131. It's not actually the master cylinder that needs to be bled as much as the brake lines. When you open the brake line to install the actuator you will be allowing air bubbles to get into the lines which is what bleeding the brake system gets rid of. When you bleed the brakes on your trailer after installing the actuator, you will want to start with the brake that is furthest away from the actuator. Of...
    view full answer...


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Info for this part was:

Edited by:
Leah B
Written by:
Lindsey S
Installed by:
Jeff D
Expert Research:
Jameson C
Updated by:
Laura H

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