How do I Convert Trailer Brakes to an Electric over Hydraulic System?

Converting trailer brakes to an electric over hydraulic system is a multi-step process that involves upgrading your trailers stopping power and control. According to Axle Inc., the process generally follows these steps:

1. Preparation and Compatibility: Start by measuring your axle dimensions (width, hub face, and spring centers) to ensure the conversion kit fits your specific axle type and load rating. This is critical for trailers hauling over 7,000 lbs.
2. Component Mounting: Unpack your hydraulic disc brake conversion kit and secure the brake rotors to the axle hubs, torquing them to 80-100 ft-lbs. Next, install the hydraulic calipers over the rotors and tighten the bolts to 25-30 ft-lbs.
3. Plumbing and Wiring: Route hydraulic brake hoses from the actuator to each caliper using flare fittings for secure seals. Bleed the system with DOT 3 fluid to remove any air. For the electric over hydraulic component, wire the 12V actuator to the trailer brake controller output and ground it to the frame.
4. Testing: Inspect all connections for leaks and perform a low-speed test tow to confirm the system is syncing correctly with your tow vehicle.

Professional installation is recommended to ensure compliance with SAE safety standards and to guarantee proper alignment for smoother, proportional braking.