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If your drum brakes are worn or not stopping as they should, this Hydrastar kit gives you a full electric-over-hydraulic disc brake setup. Each 12" Dacromet-coated hub-rotor assembly includes the inner (25580) and outer (15123) bearings along with the races, seals, and grease caps. The actuator ties right into your existing brake controller for smooth, even braking that’s consistent even at highway speeds.
Hauling weight down long grades takes solid braking power. The included actuator activates the trailer brakes the instant you press the pedal in your tow vehicle, giving fast response and shorter stopping distances than drum brakes. You get the same controlled feel as a truck brake system, with no lag or uneven grab.
This kit comes ready to bolt on with all the lines and fittings for a tandem-axle trailer. It includes 188", 76", and 48" steel brake lines plus four 21" flexible rubber lines and all brass fittings, clamps, and self-tapping screws. It’s built so you can lay it out cleanly on your frame without hunting for extra parts.
Road spray and salt can destroy uncoated rotors fast. The four Dacromet-coated disc brake end kits resist corrosion to keep braking consistent over time. With fewer moving parts than drum brakes and coated hardware throughout, there’s less upkeep and fewer replacements down the road.
Each hub is designed for 6,000-lb axles and uses a standard 6 on 5-1/2" bolt pattern that fits common wheel sizes. The integrated hub-and-rotor design keeps everything aligned for smoother rotation and balanced braking. It’s a solid upgrade that delivers consistent performance season after season.
Customer Satisfaction Score:
89% were satisfied with this product
11% of customers were not satisfied
Ratings & Reviews
Great setup. Really improved the stopping power of my 36' fifth wheel. Just completed a coast to coast trip. The extra stopping power provided additional safety and peace of mind.
It's been working great for the past year. Wish I had the money to put on all of my trailers.
The quality of the product was good. Everything went together and function as intended. Thanks
Installed fairly easily, works great. Stops much faster than the old drum brakes.
Nice quality, fast shipment, and fairly easy installation. The brake line from the actuator to the first axle is quite long. I will go back with a custom line in the future, for now just coiled it up. William S was extremely helpful with my order.
Overall a great kit. Only wish would be to use rubber lined SS adel clamps instead of the supplied plastic ones
Prices, promptness of shipping and delivery, and customer service is the best I have ever done business with.
looks great,not done yet.
Lauren is the best.
Parts were shipped and received quickly, everything mounted up right and all the hardware needed was included.
Thanks for quickly resolving the shipping problem!!
The items seen good quality but the problem is with Hydrastar as a company, calling out customer service, packaging and shipping departments. If it wasn't for great effort from Fred at etrailer I don't thinkl I would try working with this brand again. The packaging was so bad that the rotors ate themselves up. The studs on one rotor scared the other inside the area where the dust cap sits also ruining several studs. The exterior box was in great shape. It was all on Hydrastar. After a week of waiting Fred finally reached someone. I finally received the replacements with the same subpar boxing as before. This time with only minor scratches. Install went well until we opened the actuator box and found a smashed cap. After another two weeks we finished this two month process with success. Don't try this during camping season and not without etrailers help.
Products just arrived yesterday, even though i requested packaging to be better (saw poor review comments on this before hand), it arrived in 2 large boxes that were battered to hell and opened up with contents exposed. Much to my surprise, it appears all parts are present and undamaged, going to install over weekend and will follow up with after install evaluation.
Great product...fast shipping
The manual is pretty bad, mostly because of the wiring diagram. FORTUNATELY, the assistance from etrailer and all the install videos are very helpful!
BUT, there is a need for some videos on installing all of this on a Travel Trailer. Mine is big and heavy, hence needing this kit to start with. Wiring the actuator has been a headache and a challenge because of bad diagrams, manuals and the unique layout of a Travel Trailer vs 5th wheel. The brake parts came in good shape and are of good quality. Yes, the brake parts are hefty and need better packaging from the manufacturer. Fortunately, all arrived successfully in the end.
Do you have a question about this Trailer Brake?
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At etrailer we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.
Mike L.
2/9/2026
Sorry about the difficulties you ran into there Bryan, but I'm glad we could help!!