If you’re ready to move beyond the uneven feel of drum brakes, this Hydrastar Disc Brake Kit delivers a clear upgrade. The electric-over-hydraulic actuator responds the instant you press the tow vehicle brakes, sending smooth, even pressure to all four wheels. With a maximum output of 1,600 psi from the included Hydrastar HBA16 actuator, you get the fast reaction and consistent braking needed for highway speeds and heavier loads.
This kit isn’t just a pile of parts—it’s everything set up to work together. You get four Dacromet-coated hub-rotor assemblies rated for 3,500-lb axles, matching calipers with brackets and hardware, and a full hydraulic line set for a tandem setup. Each 10" rotor uses a 5 on 4-1/2" bolt pattern with 1/2" wheel studs, and the bearings (inner L68149, outer L44649) and races (L68111, L44610) are included along with seals and grease caps. It’s a direct fit that goes together cleanly without hunting for extra pieces.
Moisture and road grime can chew through unprotected metal fast. The Dacromet coating on the hub-rotor assemblies adds a durable barrier against corrosion so your brakes stay responsive season after season. Whether you’re towing through rain or storing between trips, this finish helps keep components from seizing or pitting over time.
Everything comes matched and ready to mount—no guessing on fittings or adapters. The kit includes pre-cut steel lines in 188", 76", and 48" sections plus four 21" rubber flex lines, brass fittings (T, 4-way, unions), nylon hose clamps, and self-tapping screws. Just bolt on the brake assemblies, route the lines along the frame, connect the actuator wiring to your existing brake controller, and bleed the system. It’s built for hands-on trailer owners who want the benefits of disc brakes without a shop visit.
Disc brakes deliver consistent stopping power even at highway speeds—and they do it with fewer moving parts than drum setups. Each caliper in this Hydrastar kit has only one main moving component, cutting down on wear points that need adjustment or replacement. That means less time under the trailer and more confidence every time you hit the pedal.
Customer Satisfaction Score:
85% were satisfied with this product
15% 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.
Parts were shipped and received quickly, everything mounted up right and all the hardware needed was included.
Thanks for quickly resolving the shipping problem!!
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
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.
looks great,not done yet.
Lauren is the best.
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.
Prices, promptness of shipping and delivery, and customer service is the best I have ever done business with.
Condition: Surface Scratches
Notes: Item has minor cosmetic scratches and is missing the actuator.
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