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The Hydrastar Electric Over Hydraulic Actuator for Drum Brakes delivers up to 1,200 psi of hydraulic pressure for powerful and consistent braking. Unlike surge couplers that only react when the trailer pushes forward, this system responds instantly to your brake controller signal. That means your trailer brakes engage at the same moment you press the pedal, giving you smoother, more controlled stops and eliminating the push or jerk that happens with older-style actuators.
Designed for trailers 8,000 lbs or larger, this actuator easily powers hydraulic drum brakes on single-, tandem-, or triple-axle setups. Its electronic proportional pressure valve ensures that braking is smooth and consistent across all axles, even under heavy load. Whether you’re towing over long grades or hauling equipment day after day, it keeps braking performance even and reliable.
The durable extruded anodized aluminum body resists corrosion from water and road salt. A vented end plate releases pressure, moisture, and heat to protect internal parts and lets you safely mount it in enclosed spaces where other actuators might overheat. The weathertight seals and hardware keep the system protected so your actuator can handle years of service.
Installation is direct—mount the unit to the trailer frame using the included hardware, then connect it to your wiring and 3/16" hydraulic port lines (sold separately). The wire configuration is plainly marked: black for 12-volt power, blue for brake controller signal, yellow for breakaway, and white for ground. It works with any standard 5-amp-hour breakaway kit (sold separately) and a compatible electric brake controller. Once wired in, you’ll have electric control over your hydraulic drum brakes right from your cab.
The built-in bleeder screw makes it easy to clear air from the lines for firm pedal feel every time. The vented design helps prevent heat buildup during long hauls or frequent braking while keeping internal components dry. The result is dependable braking performance in wet marinas, dusty roads, or steep descents—every time you need it.
Do not power wash the Hydrastar actuator or take it through a commercial car wash. High-pressure water may damage the seals on the actuator.
Customer Satisfaction Score:
98% were satisfied with this product
2% of customers were not satisfied
Ratings & Reviews
Scott K.
5/12/2021
Super!
Heather A.
10/9/2020
Thank you for your review. The Hydrastar Actuator will wire to the breakaway kit of the Kaufman trailer and the electric brake controller in the tow vehicle. I have attached an electrical diagram for a visual of how the wires attach. You should already have a brake controller for the electric brakes but if you have an OEM brake controller it will need to be replaced. I recommend the Prodigy P3 90195 which is one of our most popular brake controller options. If you need a breakaway kit, I recommend Hopkins engager break away kit part 20099 because of its convenient push to test button and built in charger.
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George H.
4/3/2019
Still working great
Lori W.
10/21/2017
Hi one year later and the Hydrostar actuator I purchased is working great!
Do you have a question about this Brake Actuator?
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Frank C.
5/8/2022
Juste great, as new