Wheel Speed Sensor: Adjustments

Wheel Speed Sensor (HD Models):

NOTE: The wheel speed sensor used on HD models is adjustable by means of slots provided In the mounting bracket. The sensor must be properly adjusted in order to provide the correct air gap between the wheel speed sensor and the tone wheel. If the sensor is not properly adjusted, the tone wheel may hit the wheel speed sensor or the output from the wheel speed sensor may be low, missing, or erratic. Follow the procedure outlined below to properly adjust the front wheel speed sensor.

1. Loosely install wheel speed sensor to bracket mounting nuts and bolts. The wheel speed sensor must remain loose and move along the slots in the bracket.
2. Place the front hub and rotor assembly on a surface with the tone wheel facing up. Take care not to damage the wheel studs.
3. Mark the position of the rotor relative to the hub so the rotor can be reinstalled in the same position later.
4. Remove bolts attaching the rotor to the hub.
5. Remove the rotor from the hub.
6. Install hub and tone wheel assembly on the knuckle spindle.
7. Install outer bearing, washer and spindle nut.
8. Torque spindle nut to 12 lb. ft. while rotating the hub in either direction. Do not back off the nut.
9. Insert flexible shim stock or equivalent between the tone wheel and the wheel speed sensor.

NOTE: The thickness of the shim stock must be 1.25 mm (0.050 inch). The length and width of the shim stock must be sufficient to cover the face of the wheel speed sensor. If shim stock is not available, regular notebook or writing paper can be used, provided the specified thickness is inserted between the tone wheel and the wheel sensor.

NOTE: DO NOT use a rigid feeler gauge or a wire spark plug gap gauge to set the wheel speed sensor to tone wheel air gap as these tools will not provide the correct air gap.

10. Press wheel speed sensor firmly against the shim stock and the tone wheel.
11. Tighten sensor as follows:
a. Tighten left hand lower attaching nut to 13 Nm (10 ft. lbs.).
b. Tighten left hand upper attaching nut to 13 Nm (10 ft. lbs.).
c. Tighten right hand upper attaching nut to 13 Nm (10 ft. lbs.).
d. Tighten right hand lower attaching nut to 13 Nm (10 ft. lbs.) while holding the wheel speed sensor against the shim stock.