Rear Wheel Speed Sensor
The antilock brake system uses two-wire wheel speed sensors, known as active wheel speed sensors. The sensors use an electronic principle known as magnetoresistive to help increase performance and durability. The sensors convert wheel speed into a small digital signal. A Wheel Speed Sensor (WSS) is used at each wheel. A magnetic pole encoder serves as the trigger mechanism for each sensor. At each wheel of the vehicle there is one wheel speed sensor and one encoder.
On all-wheel-drive vehicles, the rear wheel speed sensor head (1) is secured to the rear hub and bearing (2) by a spring-loaded clip on the rear of the assembly. The encoder is integral to the hub and bearing assembly. The encoder is serviced as part of the rear hub and bearing.
On front-wheel-drive vehicles, the rear wheel speed sensor head (3) is mounted to the rear of the hub and bearing by a screw. The encoder is integral to the hub and bearing assembly. The encoder is are serviced as part of the rear hub and bearing.
The WSS air gaps are not adjustable.