MASTER CYLINDER AND VACUUM BOOSTER
The Bendix Anti-lock 4 Brake System uses a standard master cylinder/reservoir and vacuum booster. The master cylinder primary and secondary outputs go to the frame rail mounted junction block and then directly to the modulator assembly inlet ports.
MODULATOR AND PUMP MOTOR/ASSEMBLY
See Figures 1 and 2
The modulator assembly contains the electronic valves used for brake pressure modulation, and the pump/motor assembly.
The pump/motor function, as part of the modulator assembly, is to pump low pressure brake fluid from the modulator sump into the ABS accumulator, as required.
WHEEL SPEED (WSS) SENSORS
See Figures 3, 4, 5 and 6
A Wheel Speed Sensor (WSS) is located at each wheel to transmit wheel speed information to the CAB.
CONTROLLER ANTI-LOCK BRAKE (CAB)
See Figures 7, 8 and 9
The CAB is a small computer which receives wheel speed information, controls anti-lock operation and monitors system operation.
ABS BRAKE SYSTEM ON VEHICLE SERVICE
The following are general precautions which should be observed whenever servicing and or diagnosing the ABS system and other vehicle electronic systems. Failure to observe these precautions may result in ABS system damage.
- If welding work is to be performed on a vehicle using an arc welder. The wiring harness connector should be disconnected from the CAB before beginning any welding operation.
- The CAB 60-way connector and modulator assembly 10-way connector, should never be engaged or disengaged with the ignition in the on position.
- Some components of Bendix Anti-lock 4 Brake System assemblies can not be serviced separately from the assembly and will require replacement of the complete assembly for servicing. Do not disassemble any component which is designated as non-serviceable.