1. Brake Actuator
  2. Demco
  3. Surge Brake Actuator
  4. Drum Brakes
  5. No Channel or Coupler
  6. 20000 lbs GTW
Demco Unassembled Hydraulic Brake Actuator - Drum - Raw - 20K

Demco Unassembled Hydraulic Brake Actuator - Drum - Raw - 20K

Item # DM5541
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Our Price: $321.53
Brake Actuator
This item qualifies for Free Shipping
Shipping Weight: 56 lbs
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Designed for fabricating a complete trailer brake actuator to your specifications, this unassembled, unprimed surge-type actuator comes without a coupler or channel. Features a durable composite master cylinder. Includes breakaway. Call 800-298-8924 to order Demco brake actuator part number DM5541 or order online at etrailer.com. Free expert support on all Demco products. Guaranteed Lowest Price and Fastest Shipping for Demco Unassembled Hydraulic Brake Actuator - Drum - Raw - 20K. Brake Actuator reviews from real customers.
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Demco Brake Actuator - DM5541

  • Surge Brake Actuator
  • Drum Brakes
  • No Channel or Coupler
  • 20000 lbs GTW
  • Weld-On
  • Demco
  • No Lockout
  • Fabrication Coupler

Designed for fabricating a complete trailer brake actuator to your specifications, this unassembled, unprimed surge-type actuator comes without a coupler or channel. Features a durable composite master cylinder. Includes breakaway.


  • Hydraulic actuator activates trailer's brakes when tow vehicle slows or stops
    • Add on or fabricate a coupler to create a custom actuator that fits your needs
  • Unassembled and unprimed for quick and easy welding
    • Welding while unassembled prevents damage to internal components
  • 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
  • Breakaway lever activates your trailer's brakes if the trailer disconnects from the tow vehicle
    • Snap hook on safety cable ensures secure connection to lever
  • Acetal copolymer lining provides smooth operation as actuator telescopes in and out
  • Heavy-duty steel construction
  • Weld-on installation
  • Made in the USA


  • Application: trailers with hydraulic drum brakes
  • Gross towing weight: 20,000 lbs
  • Maximum tongue weight: 2,000 lbs
  • Mounting: straight, 3" wide trailer tongue
  • Model number: DA20
  • 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.

Unassembled and Unprimed

Because welding can cause damage to the internal components, this actuator comes unassembled and unprimed for your convenience. No need to waste time taking apart an actuator or risk losing important parts. Once you have the actuator welded in place, prime and paint it to match your application.

5541 Demco Hydraulic Brake Unassembled Actuator - Drum - Raw - 20K

Installation Details DM5541 Installation instructions


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Info for this part was:

Edited by:
Lindsey S
Written by:
Amanda M

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