Disc Brake System: Description and Operation

Front Disc Brake





Rear Disc Brake (4X4 Model)
The disc brake assembly consists of a caliper, piston, rotor, pad assembly and support bracket. The caliper assembly has a front dual bore, rear single bore and is mounted to the support bracket with two 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:
1. Replace all components included in repair kits used to service this caliper.
2. Lubricate rubber parts with clean brake fluid to ease assembly.
3. If any hydraulic component is removed or disconnected, it may be necessary to bleed all or part of the brake system.
4. Replace pads in axle sets only.
5. The torque values specified are for dry, unlubricated fasteners.
6. Perform the service operation 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 creates of clamping action of the piston pressing towards the rotors (outward) and the caliper slides inward toward the vehicle. This clamping action forces the linings against the rotor, creating friction to stop the vehicle.