Brake System, Anti-Lock

 WARNING: DO NOT INHALE DUST FROM BRAKES, CLUTCHES OR ASSOCIATED COMPONENTS. INHALATION OF DUST CONTAINING ASBESTOS FIBERS CAN BE INJURIOUS TO YOUR HEALTH AND COULD CAUSE CANCER OR ASBESTOSIS. COMPRESSED AIR OR BRUSHES MUST NOT BE USED TO CLEAN BRAKES, BRAKE DRUMS, CLUTCHES AND ASSOCIATED COMPONENTS. USE ROTUNDA BRAKE/CLUTCH/SERVICE VACUUM 164-R3600 OR EQUIVALENT EQUIPPED FOR THIS PURPOSE TO CAREFULLY REMOVE ANY DUST. ADHERENT DUST SHOULD BE REMOVED WITH A DAMP RAG. ANY DUST SHOULD BE CONTAINED IN A SEALED AND LABELED BAG FOR DISPOSAL. WEAR AN APPROVED HIGH EFFICIENCY CARTRIDGE OR AIR LINE RESPIRATOR AND USE EXTRA CAUTION TO AVOID BREATHING THIS DUST. USE NON-ASBESTOS REPLACEMENT PARTS WHENEVER POSSIBLE.

The 4-wheel anti-lock brake system (ABS) prevents wheel lockup by automatically modulating the brake pressure during an emergency stop. By not locking the wheels, the driver can improve steering control during hard braking and stop the vehicle in the shortest possible distance under most conditions.

The ABS controls both front and rear brakes separately. The brake pedal force required to engage the ABS function may vary with the road surface conditions. A dry surface requires greater force, while a slippery surface requires much less force.

During the ABS operation, the driver will sense a pulsation in the brake pedal, accompanied by a slight up and down movement in the pedal height. In addition, a mechanical noise from the engine compartment may be heard. The pedal effort and pedal feel during normal braking are similar to that of a conventional power brake system.

The ABS consists of the following major components:

• anti-lock hydraulic control unit (2C215)
• anti-lock brake electronic control module
• two front brake anti-lock sensors (2C204)
• one vehicle speed sensor (VSS) (9E731)
• acceleration sensor
• main relay (14N089)
• pump motor relay