Wheel Speed Sensor: Description and Operation

Anti-Lock Brake Sensor
The anti-lock brake system uses four variable-reluctance sensors to determine vehicle speed.
The anti-lock brake sensors operate on magnetic induction principles. As the teeth on the anti-lock brake sensor indicator rotate past the stationary anti-lock brake sensor, a signal proportional to vehicle speed is generated and sent to the anti-lock brake control module.


Front
The front anti-lock brake sensors are non-adjustable. The front anti-lock brake sensors and the front anti-lock brake sensor indicators are replaced separately.
The front anti-lock brake sensors are attached to the front wheel spindles. Front anti-lock brake sensor indicators are pressed onto the wheel hubs.


Rear
The rear anti-lock brake sensors are attached to the rear axle housings and the rear anti-lock brake sensor indicators are pressed onto the axle. Both are replaced separately.