A bolt-on replacement electric brake assembly engineered for 3,500-lb trailer axles. This right-hand (curb-side) unit delivers consistent electric actuation and manual star-wheel adjustment in a package sized for 13- to 15-inch wheels -- the direct upgrade your worn-out brakes need before your next trip.
Lippert part 298274 (vendor part 48-4549) is a complete 10 x 2.25 inch electric trailer brake assembly for the right-hand (passenger/curb) side of single- or tandem-axle trailers rated at 3,500 lbs. per axle. It replaces the full brake backing plate, shoes, magnet, and hardware in one assembly, making it a straightforward DIY swap for anyone comfortable with basic trailer maintenance.
Electric trailer brakes are actuated by a brake controller in the tow vehicle. When the controller sends current to the electromagnet, the magnet grabs the rotating drum and self-energizes the shoes into the drum surface -- delivering proportional, smooth stopping power without the surge of hydraulic surge brakes. This design is standard on travel trailers, fifth wheels, horse trailers, and utility trailers in the 3,500-lb axle class.
Wide shoe contact patch sized for 3,500-lb axle loads. Compatible with standard 10-inch brake drums used across most trailer axles in this class.
Configured specifically for the right (curb) side of the axle. Shoe geometry and magnet lead wire routing are mirror-imaged from the left-side unit -- do not interchange.
Built-in manual adjuster lets you set shoe-to-drum clearance precisely during install and after break-in, maintaining consistent pedal feel and equal braking force side to side.
Designed to work behind 13-inch, 14-inch, 14.5-inch, and 15-inch trailer wheels -- the most common sizes on RV and utility trailers in the 3,500-lb axle category.
The assembly attaches to the axle spindle flange using a standard 4-bolt pattern. Torque specs and bolt sizes vary by axle manufacturer, so verify your flange dimensions match before ordering. The lead wire connects to your trailer's brake wiring harness -- typically a two-wire connection (one ground, one hot from the brake controller circuit).
New electric brake shoes require a break-in period to achieve full contact and rated stopping performance. A proper break-in involves a series of moderate stops from highway speed, allowing the shoes to wear into the drum surface evenly. Skipping break-in leads to uneven contact patches, reduced braking force, and accelerated wear.
Lippert 298274 is the current production right-side brake assembly for 3,500-lb axles using a 10 x 2.25 inch shoe and drum combination. It is compatible with axles from Lippert (Dexter-style), Alko, and many other trailer axle brands that share the standard 10-inch brake drum and 4-bolt flange -- verify your axle brand and bolt pattern before purchase.