Disc Brake System: Description and Operation

GENERAL DESCRIPTION
The disc brake assembly consists of a caliper, piston, rotor, pad assembly and support bracket. The caliper assembly has a single bore and is mounted to the support bracket with 2 mounting bolts. The support bracket allows the caliper to move laterally against the rotor. The caliper is a one-piece casting with the inboard side containing the piston bore. A square cut rubber seal is located in a groove in the piston bore which provides the hydraulic seal between the piston and the cylinder wall.

NOTE:
^ Replace all components included in repair kits used to service this caliper.
^ Lubricate rubber parts with clean brake fluid to ease assembly.
^ If any hydraulic component is removed or disconnected, it may be necessary to bleed all or part of the brake system.
^ Replace pads in axle sets only.
^ The torque values specified are for dry, unlubricated fasteners.
^ Perform service operations on a clean bench free from all mineral oil materials.

OPERATION
Hydraulic pressure, created by applying the brake pedal, is converted by the caliper to a stopping force. This force acts equally against the piston and the bottom of the caliper bore to move the piston outward and to move (slide) the caliper inward resulting in a clamping action on the rotor. This clamping action forces the linings against the rotor, creating friction to stop the vehicle.