Disc Brake System: Description and Operation

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2 Of 2:

Front Disc Brake Components-4x2

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2 Of 2:

Front Disc Brake Components-4x4


WARNING: Asbestos fiber dust may be present on brake and clutch assemblies and is hazardous to health if inhaled.

Brake and clutch assemblies should be cleaned using a vacuum cleaner recommended for use with asbestos fibers such as a brake/clutch/service vacuum. The bag must be labeled per OSHA instructions, sealed, and the trash hauler notified as to the bag's contents.

If a vacuum suitable for asbestos is not available cleaning should be done wet. If dust generation is still possible, technicians should wear government-approved toxic dust purifying respirators.

Occupational health and safety act (OSHA) requires areas where asbestos dust generation is possible to be isolated and posted with warning signs. Only technicians performing brake or clutch repair should be present in the area.

On two-wheel drive vehicles:
^ The brake caliper bolts to the front wheel spindles.
^ The brake disc and hub is an integrally cast assembly.

On 4x4 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, dual piston type.
^ has two 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 anti-rattle clips.