Hydraulic System: Description and Operation
HYDRAULIC/MECHANICALDESCRIPTION
This vehicle is equipped with front disc brakes and rear drum brakes also certain vehicles have four wheel disc brakes. The front and rear disc brakes consist of dual piston calipers and ventilated rotors. The rear brakes are dual brake shoe, internal expanding units with cast brake drums. The parking brake mechanism is cable operated and connected to the rear brake trailing shoes. Power brake assist is standard equipment. A vacuum operated power brake booster is used on gas engine vehicles. A hydraulic booster is used on diesel engine vehicles.
Two antilock brake systems are used on this vehicle. A Rear Wheel Antilock (RWAL) brake system and all-wheel Antilock Brake System (ABS). The RWAL and ABS systems are designed to retard wheel lockup while braking. Retarding wheel lockup is accomplished by modulating fluid pressure to the wheel brake units. Both systems are monitored by a microprocessor which controls the operation of the systems.