ford Workshop Repair Guides

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Wheel Speed Sensor|Service and Repair > < Rear Anti-Lock Brakes (RABS)
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Wheel Speed Sensor: Description and Operation
4 Wheel Antilock Brake System

PURPOSE

The anti-lock brake system uses three sets of variable-reluctance sensors and toothed speed sensor rings to determine the rotational speed of each
wheel. 

OPERATION

The sensors operate on magnetic induction principle. As the teeth on the speed indicator ring rotate past the stationary sensor, a signal proportional
to the speed of the rotation is generated and sent to the ECU through a twisted-pair wire cable and wiring harness.

LOCATION

The front sensors are attached to the suspension knuckles, and the speed indicator rings are pressed onto the backside of the rotor. The rear sensor
is bolted into the rear axle housing and the rear speed sensor ring is pressed onto the rear axle carrier assembly.

Wheel Speed Sensor|Service and Repair > < Rear Anti-Lock Brakes (RABS)