1. Brake Actuator
  2. Demco
  3. Surge Brake Actuator
  4. Drum Brakes
  5. Channel Only
  6. 8000 lbs GTW
Demco Hydraulic Brake Actuator - Drum - Zinc - 12" Adjustable Channel Center - 8,000 lbs

Demco Hydraulic Brake Actuator - Drum - Zinc - 12" Adjustable Channel Center - 8,000 lbs

Item # DM8758521
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Our Price: $219.21
Brake Actuator
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Shipping Weight: 35 lbs
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Surge-type actuator features a corrosion-resistant composite master cylinder and durable zinc plating, making it perfect for marine use. Adjustable channel lets you mount coupler attachments (sold separately) in 1 of 5 positions. Bolt-on application. Call 800-298-1624 to order Demco brake actuator part number DM8758521 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 - 12" Adjustable Channel Center - 8,000 lbs. Brake Actuator reviews from real customers.
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  • Reviews (3)
  • Q & A (1)
  • Videos (1)
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Demco Brake Actuator - DM8758521

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

Surge-type actuator features a corrosion-resistant composite master cylinder and durable zinc plating, making it perfect for marine use. Adjustable channel lets you mount coupler attachments (sold separately) in 1 of 5 positions. Bolt-on application.


Features:

  • Hydraulic actuator activates trailer's brakes when tow vehicle slows or stops
  • Adjustable channel has 5 different mounting positions for coupler (sold separately)
  • 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: 12"
  • 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 5 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.


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.



8758521 Demco DA91 Hydraulic Trailer Brake Actuator for Drum Brakes - Channel Center - 8,000 lbs

Installation Details DM8758521 Installation instructions



Video of Demco Hydraulic Brake Actuator - Drum - Zinc - 12" 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 Demco Brake Actuator - Surge Brake Actuator - DM8758521 Review

Today we're going to be taking a look at the Demco Hydraulic Brake Actuator. This actuator is designed for trailers with hydraulic drum brakes. It has a gross towing weight capacity of 8000 pounds, and a maximum tongue weight capacity of 800 pounds. The hydraulic actuator activates your trailer's brakes when your tow vehicle slows down or stops. As your trailer moves forward when your vehicle starts to slow down, the actuator contracts, which is going to apply force to its master cylinder, that's an internal component, and then in turn it supplies the necessary hydraulic pressure to engage your trailer's breaks. That's basically how the unit works. This one in particular's going to feature an adjustable channel, that's this area right here, very, very versatile option, it's going to give you 5 different mounting positions for a coupler.

There's a wide variety of couplers to choose from, couplers are sold separately, you can check out some options here at etrailer.com. Now the mount holes on the adjustable portion, these are going to separated on center by 2 inches, and they're going to have a diameter of 5, 8, 7 inch. The unit's made from a heavy duty steel construction, it's going to feature a zinc plating, it's going to do a great job at resisting rusting corrosion. This one is going to feature a 500 hour salt spray rating, so it's going to be great for marine applications. When it comes to the construction of the master cylinder, the master cylinder is this portion back here. This is a composite material, when it comes to the master cylinder it's very durable, very efficient, it's going to feature glass reinforced nylon construction, it's going to resist rusting corrosion, it's got a nice large reservoir that's going to provide increased capacity for brake fluid, and it's going to feature an automotive style diaphragm cap that keeps complete closure.

It's going to keep this area completely closed when it comes in the system, that's going to help prevent contamination of the fluid. I also want to mention that is does come with a breakaway system. The cable and the hook is attached to this line right here. The hook would attach to your tow vehicle, so in the event where your trailer would ever disconnect from your tow vehicle, the cable would be pulled, it would move this lever back to a braking position, which would then bring your trailer to an eventual stop, it would engage the breaks on the trailer bringing it to a stop. That is included. This is a bolt on installation, you're going to have 3 mounting holes located on each side. It does require a half inch by a 4 and a half inch, that's half inch diameter by 4 and a half inch long grade 5 bolts for mounting, those are not included.

The product's made right here in the USA. The cap right here, again, is to put the fluid into the reservoir of the master cylinder. You'll notice that these mounting plates, you got 1 here, and you got 1 the other side. The distance between those plates, that's going to be 3 inches. This is designed to mount onto a straight 3 inch wide trailer tow.

When it comes to the channel width, we're talking about our bracket right here. Externally, outside edge to outside edge is about 3 and 3 8ths. Internally is about 2 and 7 eights. Top to bottom is going to be 12 inches. This is model number DA91. Overall length, front to this portion right here is going to be about 24 inches. These 2 mount holes are separated on center by 3 inches, and the distance between this mount hole to this mount hole on center is 9 and a half inches. Now please keep in mind that because this actuator does not include a reverse lockout, it is recommended that you equip your trailer with 3 backing brakes, that way you can drive and reverse without the actuator triggering your trailer's brakes. That's going to do it for today's look at the Demco Hydraulic Break Actuator.


Customer Reviews

Demco Hydraulic Brake Actuator - Drum - Zinc - 12" Adjustable Channel Center - 8,000 lbs - DM8758521

Average Customer Rating:  4.7 out of 5 stars   (3 Customer Reviews)

Surge-type actuator features a corrosion-resistant composite master cylinder and durable zinc plating, making it perfect for marine use. Adjustable channel lets you mount coupler attachments (sold separately) in 1 of 5 positions. Bolt-on application.

- DM8758521
by:

etrailer is a great, fast delivery, great communications and great customer service!



- DM8758521
by:

Works great!



- DM8758521
by:

GREAT! Helped us out in a bind. Ordered on Friday, part showed up in Cali on Tuesday! :)


3
3

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Info for this part was:

Employee Leah B
Edited by:
Leah B
Employee Lindsey S
Written by:
Lindsey S
Employee Laura H
Updated by:
Laura H
Employee Noah M
Updated by:
Noah M
Employee Cole B
Installed by:
Cole B

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