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  1. Brake Actuator
  2. Demco
  3. Surge Brake Actuator
  4. Drum Brakes
  5. 2-5/16 Inch Ball Coupler
  6. 12500 lbs GTW
Demco Hydraulic Brake Actuator - Drum - Primed - 2-5/16" Ball - 12,500 lbs

Demco Hydraulic Brake Actuator - Drum - Primed - 2-5/16" Ball - 12,500 lbs

Item # DM8103102
Our Price: $648.95
Brake Actuator
This item qualifies for Free Shipping
Shipping Weight: 52 lbs
Demco Surge Brake Actuator - DM8103102
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Surge-type actuator features a corrosion-resistant composite master cylinder and a primed finish. eZ-Latch coupler mechanism makes hookup a snap. Weld-on application 1-833-496-1390 to order Demco brake actuator part number DM8103102 or order online at Free expert support on all Demco products. Guaranteed Lowest Price and Fastest Shipping for Demco Hydraulic Brake Actuator - Drum - Primed - 2-5/16" Ball - 12,500 lbs. Brake Actuator reviews from real customers.
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Demco Brake Actuator - DM8103102

  • Surge Brake Actuator
  • Drum Brakes
  • 2-5/16 Inch Ball Coupler
  • 12500 lbs GTW
  • Weld-On
  • No Lockout
  • Straight Tongue Coupler
  • Demco

Surge-type actuator features a corrosion-resistant composite master cylinder and a primed finish. eZ-Latch coupler mechanism makes hookup a snap. Weld-on application


  • Hydraulic actuator activates trailer's brakes when tow vehicle slows or stops
  • eZ-Latch coupler mechanism for simple, secure hookup and disconnect
    • Lets you hook up when latch is in closed position - just drop coupler over hitch ball and latch will snap into place
  • 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
    • Snap hook on safety cable ensures secure connection to breakaway lever
  • Heavy-duty steel construction
  • Primed finish
  • Weld-on installation
  • Made in the USA


  • Application: trailers with hydraulic drum brakes
  • Ball size: 2-5/16"
  • Gross towing weight: 12,500 lbs
  • Maximum tongue weight: 1,250 lbs
  • Mounting: straight, 3" wide trailer tongue
  • Model number: DA10
  • 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.

eZ-Latch Coupler

The coupler portion of this trailer brake actuator features a simple-to-use latching mechanism known as the eZ-Latch. With this mechanism, hooking up is as easy as dropping the coupler over your trailer hitch ball. The latch does not need to be tugged or manually activated to allow the ball into the coupler socket, nor does it have to be secured in place. Just make sure that the coupler is properly lined up with the ball when you lower it, and the rest is automatic.

Demco eZ-Latch in Use

8103102 Demco DA10 Hydraulic Trailer Brake Actuator for Drum Brakes - 2-5/16" Ball Easy Latch Coupler - 12,500 lbs

Installation Details DM8103102 Installation instructions


See what our Experts say about this Demco Brake Actuator

  • Demco DA10 Brake Actuator for 4" Square Trailer Tongue
    I do have a solution for you, but the Demco Hydraulic Brake Actuator # DM8101802 is made to fit the more common 3" wide trailer tongues, so the mounting bracket won't work with your 4" trailer tongue. Instead, I recommend the Demco # DM8103102. This is the same actuator you were looking at but doesn't include the mounting bracket. You will be able to weld this to your trailer frame no problem.
    view full answer...
  • Coupler Lock Recommendation for use on a Coupler that has a 5 inch Wide Flange
    It looks like would need to get a latch coupler lock like a Master Lock Adjustable Trailer Coupler Lock - Stainless Steel, part # 2847DAT, for your Four Winns trailer that has a 5 inch wide flange. I attached a link to a review video of this coupler lock for you to check out. We do not have a surround coupler lock that will be wide enough to fit on a coupler that has a distance of 5 inches across.
    view full answer...
  • Replacing Hydraulic Drum Brakes on 1991 EZ Loader Boat Trailer
    To determine the correct hydraulic drum brakes to replace those on your 1991 EZ Loader two axle boat trailer, you will want to measure the drum behind the wheels. Based on the pictures you sent and the information you provided, the axles on the trailer are most likely either 3,500 or 5,200 pound axles. Using this, along with the the fact that the axle has a 5 bolt mounting flange, the compatible replacement is most likely going to be hydraulic brakes rated for 5,200 pound axles. I recommend...
    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 Laura H
Updated by:
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