5 - 106 ANTI-LOCK 6 BRAKE SYSTEM

²CABÐController Anti-Lock Brake

²ABSÐAnti-Lock Brake System

²PSIÐPounds per Square Inch (pressure)

²WSSÐWheel Speed Sensor

NORMAL BRAKING SYSTEM FUNCTION

Under normal braking conditions, the ABS System functions the same as a standard brake system with a diagonally split master cylinder and conventional vacuum assist.

If a wheel locking tendency is detected during a brake application, the system will enter Anti-Lock mode. During Anti-Lock Braking, hydraulic pressure in the four wheel circuits is modulated to prevent any wheel from locking. Each wheel circuit is designed with a set of electrical valves and hydraulic line to provide modulation, although for vehicle stability, both rear wheel valves receive the same electrical signal. The system can build or reduce pressure at each wheel, depending on the signals generated by the wheel speed sensors (WSS) at each wheel and received at the Controller Anti-Lock Brake (CAB).

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Fig. 2 Master Cylinder Brake Booster Assemble

MAJOR COMPONENTS

The following is a list of major system components. Details of all components can be found later in this section. See (Fig. 1) for the general location of the components in the vehicle.

MASTER CYLINDER AND VACUUM BOOSTER

The Bendix Anti-Lock 6 Brake System uses the vehicles standard Master Cylinder/Reservoir and Vacuum Booster (Fig. 2). The master cylinder primary and secondary outputs go directly to the Modulator Assembly.

MODULATOR AND PUMP MOTOR/ASSEMBLY

The Modulator Assembly (Fig. 3) contains the wheel circuit valves used for brake pressure modulation and the Pump/Motor.

The Pump/Motor function, as part of the Modulator Assembly. Is to pump low pressure brake fluid from the brake fluid sump into the ABS Accumulator. During a stop which requires the ABS system to become operational.

WHEEL SPEED SENSORS

A Wheel Speed Sensor (Fig. 4) is located at each wheel to transmit wheel speed information to the Controller Anti-Lock Brake (CAB).

CONTROLLER ANTI-LOCK BRAKE (CAB)

The (CAB) (Fig. 5) is a small control computer which receives wheel speed information, controls Anti-Lock operation and monitors system operation.

Fig. 3 Modulator And Pump/Motor Assembly

ANTI-LOCK BRAKES OPERATION AND PERFORMANCE

This Anti-Lock Braking System represents the current state-of-the-art in vehicle braking systems and offers the driver increased safety and control during braking. This is accomplished by a sophisticated system of electrical and hydraulic components. As a result, there are a few performance characteristics that may at first seem different but should be considered