Disc Brake System: Description and Operation

Front Disc Brake
On rear wheel drive (RWD) vehicles:
^ The brake caliper bolts to the front wheel spindles.
^ The brake disc and hub is an integrally cast assembly.

On four wheel drive (4WD) vehicles:
^ The front disc brake caliper bolts to the front wheel knuckle.
^ A separate brake disc attaches to the wheel hub.

The front disc brake caliper:
^ is a pin slider.
^ has 2 caliper pistons.

The caliper has a fluid inlet at the center of the housing. A square section seal fitted into an annular groove in the caliper cylinder bore seals against hydraulic pressure, while rubber boots seal the caliper pistons and caliper bore from contamination.

The brake disc shield:
^ bolts to the front wheel spindle.
^ protects the bearings and inboard surface of the brake disc.

The pads are:
^ contained within the front disc brake caliper anchor plate.
^ held to the front disc brake caliper anchor plate abutments by disc brake pad clips.