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The Hydrastar Electric Over Hydraulic Actuator for Disc Brakes delivers up to 1,600 psi of pressure for strong, consistent braking on single-, tandem-, or triple-axle trailers. It uses a 12V DC pump that responds instantly when your brake controller sends a signal, so braking happens as soon as you press the pedal. That means no push or delay like surge couplers—just direct control and smooth stops every time.
Unlike surge systems that rely on trailer movement to activate brakes, this actuator engages hydraulics based on electrical input from your in-cab controller. You can also use the manual override on your brake controller to apply trailer brakes independently. And since there’s no mechanical coupler involved, you don’t need to lock out the brakes when backing up—the system automatically stays disengaged when reversing.
The extruded anodized aluminum housing resists corrosion and stands up to marine and road environments. A vented end plate releases heat, moisture, and pressure so internal components stay protected even when installed in tight compartments. With DOT compliance and durable seals throughout, the actuator is ready for long-term service in demanding conditions.
Installation is straightforward with four clearly labeled wires—black for 12-volt power, blue for the brake controller signal, yellow for breakaway, and white for ground. The built-in bleeder screw makes it easy to purge air from the lines during setup or maintenance. A standard 3/16" hydraulic port connects directly to common trailer brake lines. Once wired and bled, the system is ready to deliver smooth proportional braking you can count on.
Customer Satisfaction Score:
97% were satisfied with this product
3% of customers were not satisfied
Ratings & Reviews
Larryd
9/15/2015
The HBA16 is still performing well after 5K miles. Great product.
Eddie
7/1/2019
Love love this brake system, going to put one on my other trailer I’m restoring.
Laura E.
5/31/2017
Thanks for your business and your review, Chris! For your reference, the # HBA-CAM is a required rather than optional add-on for 2007-2015 Chevy and GMC trucks and will not work with the OEM factory-installed brake controller.
Helpful Links
Morris G.
7/26/2021
Working great as well as it did since installation
Roger F.
11/29/2017
My brakes are working just as expected and hoped for. The real good news and the thing I remember about this project was how helpful the trailer folks were.
Billy K.
8/28/2018
Unit it working well. I am very happy and satisfied with this unit. Thank you
Michael
5/9/2020
The actuator worked great last year traveled over 5000 miles with it. As of late last fall my boat was stored on my trailer and because of covid19 the marina here on the east coast of Quebec wont open for another 6 weeks. The actuator was wrapped in plastic to protect it from the harsh winter here close to the ocean. I expect and need it work as it my trailer has to be certified road worthy to pull it on the public hwy. I will give you an up date in a couple of months. thks
Albert
4/6/2020
Always works. Extra bonus was when I realized I could pull the release pin and hook up the fifth wheel without pushing the trailer up on the chocks or wheel lock so much.
Henry S.
9/23/2021
excellent
Jim B.
7/10/2018
The brake actuator has worked flawlessly. You can’t beat hydraulic disc brakes on a trailer. The stopping power is amazing. Thanks for checking up on me!
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Patrick
8/22/2025
Works exactly as it should, electric over hydraulic disc brakes on a three axle aluminum 13k trailer.