Purpose-built for left-side (roadside) installation on trailers and RVs with 3,500 lb axles, this Lippert electric brake assembly delivers consistent, electromagnetically actuated stopping power with a built-in parking brake function. No hydraulic lines, no fluid changes -- just a clean electric system that integrates directly with your brake controller.
The Lippert 297956 (vendor part 48-4548) is a direct-replacement electric brake assembly sized at 10 inches by 2.25 inches -- the standard configuration for single-axle and tandem-axle trailers running up to 3,500 lb per axle. It mounts to a standard four-bolt brake flange and is compatible with 13, 14, 14.5, and 15 inch wheels, making it a practical fit across a wide range of travel trailers, toy haulers, and utility trailers.
The assembly uses an electromagnetic actuator (magnet and armature) to engage the brake shoes when current is sent from the tow vehicle's brake controller. Manual star-wheel adjustment lets you dial in shoe clearance for optimal bite without disassembling the hub. The integrated parking brake lever adds holding capability on grades -- useful for unhitching on uneven ground.
Designed exclusively for left-side (driver/roadside) axle flange installation. Shoe geometry and adjuster orientation are handed -- do not swap with right-side assemblies.
Bolts to the standard four-bolt brake flange pattern common on Dexter, Lippert, and most 3,500 lb trailer axles. Mounting hardware sold separately.
Built-in parking brake lever and cable attachment point allow this assembly to serve dual duty as a holding brake when the trailer is unhitched.
Inline star-wheel adjuster lets you set shoe-to-drum clearance by hand through the backing plate slot -- no special tools required.
Electric trailer brakes actuate via a signal from the tow vehicle's brake controller, with no hydraulic master cylinder, brake fluid, or surge coupler needed. That means simpler maintenance, no fluid contamination risk, and easy gain adjustment right from the cab. For most RV and light-trailer applications, electric is the preferred system -- and this Lippert assembly is built to those standards.
This assembly is engineered for axles rated at 3,500 lbs and fits the following wheel diameters:
It is compatible with standard 10 x 2.25 inch brake drums found on most 3,500 lb Dexter, Lippert (formerly Lippert/Actuant), and comparable OEM axles. Verify your existing drum diameter and backing plate bolt pattern before ordering. This is a left-hand assembly only -- a separate right-hand part number is required for the opposite side.
Installation is a straightforward DIY job with basic hand tools. General process: