Service manual

Group 59 Anti-Lock Brake System (Bendix) Design and Function
Sensor
The sensor is a magnetic inductor that allows current to
flow through it from the ECU when one of the wheel
teeth is in front of it. It continuously provides wheel
speed information to the ECU whenever the ignition is
ON, regardless of whether or not the vehicle is in motion.
The sensors are installed in brackets that are bolted to
the brake spider. Each sensor is held in the bracket by a
spring clip. It is installed such that the sensor is as close
to the tooth wheel as possible.
W5000579
Magnetic inductor sensor
The standard ABS has 4 sensors. On all vehicles
equipped with ABS, each front wheel has a sensor, and
there is one sensor for each complete set of rear
wheels. For example, on a 4x2 vehicle, each rear wheel
has a sensor. On a 6x4 vehicle with air suspension, the
rear drive axle has the rear sensors. On a 6x4 with other
suspension types, the forward drive axle has the rear
sensors. A 6x4 vehicle with TCS has 6 sensors.
W5000635
Typical ABS sensor installation
1) Spider mounting bolts 4) Spring clip
2) Sensor bracket 5) Tooth wheel
3) Sensor
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