Disc Brake System Description and Operation: Notes

Fig 1: View of Piston, Rotor, and Pads

Courtesy of GENERAL MOTORS CORP.

NOTE: Refer to Brake Caliper Notice in Cautions and Notices.

This caliper has a single bore and is mounted to the steering knuckle with two mounting bolts. Hydraulic pressure, created by applying the brake pedal, is converted by the caliper to a stopping force. This force acts equally against the piston (1) and the bottom of the caliper bore to move the piston outward and to slide the caliper inward, resulting in a clamping action on the rotor (2). This clamping action forces the linings against the rotor, creating friction to stop the vehicle.

Replace all components included in the repair kits used to service this caliper.
Lubricate the rubber parts with clean brake fluid to ease assembly.
Do not use lubricated shop air on brake parts, as damage to the rubber components may result.
If any hydraulic component is removed or disconnected, it may be necessary to bleed all or part of the brake system.
Replace the pads (3) in axle sets only.
The torque values specified are for dry, unlubricated fasteners.
Perform the service operations on a clean bench, free from all mineral oil materials.