When just a brake pad exchange will not do, Zero/Sports developed a 4 Piston Brake Caliper Kit for circuit use. In addition to superior braking stability, the lightweight aluminum lessens unsprung weight substantially. The special heat dissipation characteristics of the brake pad make it possible to reach high temperatures without losing braking efficiency. Kit contents: The brake caliper, the brake pad, the rotor, the hose and the installation bracket, and bolts for complete bolt on installation. Kit is designed for use with stock size diameter wheels.