Equip your semi to be Ready for the Road Ahead , with the HD Value 12-1/4" x 3-3/8" 8K LH Self- Adjusting Electric Brake, a key piece that offers safe and reliable stopping power. Due to its specialized design, this replacement brake allows operators to remotely control the brakes on trailers by sending an immediate electronic signal. Constructed with an easy-to-install and adjustable design to rapidly resolve problems within a trailer's parking mechanism. FleetPride is your First Click in Heavy Duty .