Brake Actuator

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Demco

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Surge Brake Actuator

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Drum Brakes

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Channel Only

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8000 lbs GTW

Demco Hydraulic Trailer Brake Actuator - Drum Brakes - Zinc Plated - Adjustable Channel - 8,000 lbs

Demco Hydraulic Trailer Brake Actuator - Drum Brakes - Zinc Plated - Adjustable Channel - 8,000 lbs

Item # 8759121

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Brake Actuator

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8759121 - Bolt-On Demco Brake Actuator
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Surge-type actuator features a corrosion-resistant composite master cylinder and durable zinc plating, making it perfect for marine applications. Adjustable channel lets you mount different coupler attachments (sold separately). Call 800-298-8924 to order Demco brake actuator part number 8759121 or order online at etrailer.com. Free expert support on all Demco products. Guaranteed Lowest Price and Fastest Shipping for Demco Hydraulic Trailer Brake Actuator - Drum Brakes - Zinc Plated - Adjustable Channel - 8,000 lbs. Brake Actuator reviews from real customers.
  • All Info
  • Reviews (1)
  • Q & A (3)
  • Videos (1)
  • Photos
  • Why etrailer?

Demco Brake Actuator - 8759121

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

Surge-type actuator features a corrosion-resistant composite master cylinder and durable zinc plating, making it perfect for marine applications. Adjustable channel lets you mount different coupler attachments (sold separately).


Features:

  • Hydraulic actuator activates trailer's brakes when tow vehicle slows or stops
  • Adjustable channel has 3 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 ensures 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 3-1/2"
  • Mounting: 3" wide channel 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.


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.



8759121 Demco DA91 Hydraulic Trailer Brake Actuator for Drum Brakes - Channel Center - 8,000 lbs







Video of Demco Hydraulic Trailer Brake Actuator - Drum Brakes - Zinc Plated - Adjustable Channel - 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 - 8759121 Review

Today we're going to take a look at the Demco Adjustable Channel Drum Brake Actuator with an 8,000 lbs weight capacity. This hydraulic actuator will activate you trailer brakes when you 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. With the surge brake system this hydraulic actuator is triggered as your trailer moves forward once your tow vehicle starts to slow down. When this happens this actuator will contract and it applies force. It goes back into the cylinder here, applies force to the master cylinder, and then this in turn supplies the necessary hydraulic pressure to engage your trailer brakes. On the inside of this where it slides in there's an acetyl copolymer lining which ensures a nice smooth operation as the actuator telescopes in and out. The adjustable channel on the front here has three different mounting positions to mount your coupler that you need for your application.

Now the couplers we do sell separately on out website. This actuator has a nice zinc plating to give you excellent corrosion resistance. It goes through a 500 hour salt spray rating. It's great for marine applications. The master cylinder on the very back here is a glass reinforced nylon construction. Resists rust and corrosion.

It has a very large reservoir which provides increased capacity for the brake fluid. Up at the top here you can see this automotive-style diaphragm cap creates a completely encloses system to help prevent any contamination of the fluid. The breakaway is included. Let me just show you here. We'll unhook it here. Got this breakaway kit right here.

Basically you can see this cable with the S hook on it. You hook this to your tow vehicle. What will happen is in a situation where your trailer will detach from your tow vehicle, it will pull this lever which would end up activating the brakes on this actuator to apply the brakes on the trailer. Prevents a runaway situation. Now this is made of a heavy-duty steel construction. You'll notice on the bottom here these tabs with the holes, this is a bolt-on installation.

They do require 1/2 inch by 4 1/2 inch grade 5 bolts when mounting this. They are not included. You would have to buy those separately. This part is made in the USA. Again the application for this actuator is trailers with hydraulic drum brakes. The channel width that this mounts to on your trailer is a 3 inch wide channel tongue. Gross towing weight capacity is 8,000 lbs. Maximum tongue weight capacity is 800 lbs. This also goes by the model number of DA91. I do want to give you a few measurements on the channel itself. The channel width, which is measured inside to inside is right at approximately 3 inches and the channel height from the very bottom to the top is right at 8 inches. The last thing I do want to mention is on this actuator on the very back here if you'll see here's where the master cylinder is, here's where your brake line, your hydraulic break line would attach. This bottle actuator does not include a reverse lockout, so we do recommend that you equip your trailer with free backing brakes so that you can drive in reverse without triggering your trailer's brakes. That should do it for the review on the Demco Adjustable Channel Drum Brake Actuator with an 8,000 lbs weight capacity.


Customer Reviews

Demco Hydraulic Trailer Brake Actuator - Drum Brakes - Zinc Plated - Adjustable Channel - 8,000 lbs - 8759121

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

Surge-type actuator features a corrosion-resistant composite master cylinder and durable zinc plating, making it perfect for marine applications. Adjustable channel lets you mount different coupler attachments (sold separately).

- 8759121
by:

Product as described. Fits well. Works well. At a reasonable price. Packaging a little shaky though. I will use etrailer again and recommend to others. 472297


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Info for this part was:

Installed by:
Jeff D
Expert Research:
Jameson C
Updated by:
Laura H

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