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Old drum brakes can fade or drag when you need them most. This Hydrastar Disc Brake Kit w/ Actuator for Tandem Axle Trailers upgrades your setup with four 12" hub-rotor assemblies rated for 6,000-lb axles and a 6 on 5-1/2" bolt pattern. The electric-over-hydraulic actuator ties into your existing in-cab brake controller to deliver smooth, even braking and faster response at highway speeds. You’ll feel a clear difference in stopping power and control, especially when towing in traffic or on long grades.
Corrosion can ruin brake performance fast, especially when you’re towing through rain or launching near saltwater. Each of the four disc brake end kits is finished in Dacromet for rust resistance, and the calipers themselves are stainless steel for long-term protection. The actuator’s aluminum construction and weathertight seals allow it to be mounted outside without worry—just avoid blasting it with a power washer so the seals stay intact.
Everything you need for a tandem-axle installation comes in the box—mounting brackets, hardware, and a hydraulic line kit with pre-flared fittings. The kit includes 188", 70", and 21" brake lines, brass T and union fittings, clamps, and self-tapping screws. Bearings (25580 inner, 15123 outer), races (25520 inner, 15245 outer), seals (2.25" ID x 3.376" OD), and grease caps are all included inside the hub-rotor assemblies so you can assemble with confidence and save time on setup.
Disc brakes have only one moving part—the caliper—making them simpler to maintain than drum systems with multiple springs and adjusters. This design means fewer parts to service or replace down the road while delivering consistent braking even under heavy use. With dependable performance and components built for longevity, this Hydrastar kit takes the work out of keeping your trailer braking strong season after season.
Customer Satisfaction Score:
94% were satisfied with this product
6% of customers were not satisfied
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Mike L.
2/9/2026
Sorry about the difficulties you ran into there Bryan, but I'm glad we could help!!