Front Disc Brakes

Upon application of the brakes, fluid pressure behind the caliper piston increases. Pressure is exerted equally against the bottom of the piston and also against the bottom of the piston bore. The pressure applied to the piston is transmitted to the inner shoe and lining, forcing the lining against the inner rotor surface. The pressure applied to the bottom of the piston bore forces the caliper to slide, or move on the mounting bolts toward the inner side, or toward the car. Since the caliper is one piece, this movement toward the car causes the outer section of the caliper to apply pressure against the back of the outer shoe and lining assembly, forcing the lining against the outer rotor surface. As line pressure builds up, the shoe and lining assemblies are pressed against the rotor surfaces with increased force, bringing the car to a stop. When line pressure is released, the seal and seal groove cause the piston to be slightly retracted, resulting in less drag on the rotor by the shoe and lining assembly. Lining wear is automatically compensated for by the sliding action of the caliper.