A fully pre-assembled, drop-in replacement electric drum brake for the driver's side of trailers running 3500 lb axles. Everything mounts to a new backing plate out of the box -- swap out your worn or failed brake in a fraction of the time of a component-by-component rebuild.
Worn trailer brakes are a safety issue, not just a maintenance checkbox. The Lippert 122258 ships with brake shoes, hardware, magnets, and wiring leads all pre-mounted to a fresh backing plate. You cut the old wires, unbolt the old backing plate, bolt up the new assembly, and connect the leads. No pressing shoes, no setting spring tension from scratch, no loose hardware to drop in a driveway.
This assembly is designed for the left-hand (driver's side) of the trailer. The 10" drum diameter and 2.25" center hole size match the standard 3500 lb axle spec used across most mid-size travel trailers, fifth wheels, and utility trailers. The 4-hole bolt pattern is the industry standard for this axle class.
Shoes, springs, hardware, and magnet are installed at the factory. Bolt on and wire in -- no rebuild from parts.
Meets Canadian Standards Association requirements for electric trailer brake assemblies. Compliant for use in the US and Canada.
Fits Dexter, Fayette, Hayes, Alko, Axletek, and Lippert 3500 lb axles with the standard 4-hole 10" brake flange.
Uses a traditional manual star-wheel adjuster. Set your shoe clearance at installation and re-adjust after the break-in period.
This brake assembly is designed for 3500 lb rated axles using a 10" brake drum. The backing plate uses the standard 4-hole bolt pattern with a 2.25" center hole diameter -- the same pattern used by the major axle manufacturers listed below.
This assembly works with any standard electric brake controller installed in the tow vehicle. The magnet inside the drum interacts with the rotating drum to apply the shoes proportionally based on controller output. This is not a hydraulic or surge brake -- it requires a 12V brake controller wired to the trailer's brake circuit.
Typical tow vehicle wiring supplies 12V DC to the brake output wire on the 7-way trailer connector. Each brake assembly draws approximately 3 amps at full actuation, which is within the output range of all common proportional and time-delayed brake controllers.