Wheel Speed Sensor Replacement 2WD (except C3500HD)
Removal Procedure
- Raise vehicle.
- Remove tire and wheel. Refer to
Wheel Removal
.
- Remove brake caliper. Refer to
Brake Caliper Replacement
.
- Remove the hub and rotor. Refer to
Hub and Rotor Assembly Replacement
.
- Remove wheel speed sensor
cable electrical connector.
- Remove wheel speed sensor
cable mounting clips (4) from frame attachment points.
- Remove wheel speed sensor
mounting bolts (8) and nuts (15).
- Remove two 11 mm splash shield mounting bolts.
- Remove wheel speed sensor and splash shield assembly (10).
- Remove splash shield gasket.
- Clean gasket and knuckle (12) surfaces thoroughly with a dry cloth.
Installation Procedure
- Install splash shield
gasket.
- Install wheel speed sensor splash shield.
- Install two 11 mm splash shield mounting bolts.
Tighten
• | Tighten the splash shield mounting bolts to 16 N·m
(12 lb ft) |
• | Tighten the speed sensor mounting bolts to 26 N·m
(19 lb ft) |
- Install harness clips
(4), fastening bolts and nuts (5) to the frame attachment points.
- Install the hub and rotor. Refer to
Hub and Rotor Assembly Replacement
.
- Install brake caliper. Refer to
Brake Caliper Replacement
.
- Install tire and wheel. Refer to
Wheel Removal
.
Wheel Speed Sensor Replacement 4WD
Removal Procedure
- Raise vehicle.
- Remove tire and wheel. Refer to
Wheel Removal
.
- Remove brake caliper. Refer to
Brake Caliper Replacement
.
- Remove the hub and rotor. Refer to
Hub and Rotor Assembly Replacement
.
- Remove wheel speed sensor
mounting clip (2) on the control arm.
- Remove wheel speed sensor
mounting clip (2) on the frame rail.
- Remove wheel speed sensor
electrical connector (6).
NOTICE: Carefully remove the sensor by pulling it straight out of the bore.
DO NOT use a screwdriver, or other device to pry the sensor out of the bore.
Prying will cause the sensor body to break off in the bore.
Important: The wheel speed sensor mounts into a bore that leads to the center of
the sealed bearing. Use caution when cleaning or working around the bore.
Do not contaminate the lubricant inside the sealed bearing. Failure to
do so can lead to premature bearing failure.
- Remove wheel speed sensor from hub and bearing assembly.
Installation Procedure
Important: The new speed sensor will have a new O-ring. Dispose of the old O-ring.
Lubricate the new O-ring lightly with bearing grease prior to installation.
You may also lubricate the sensor just above and below the new O-ring.
Do Not lubricate the bore.
- Install sensor into the
hub and bearing assembly (5).
Tighten
Tighten the sensor mounting bolts to 18 N·m (13 lb ft).
Important: The new sensor has new mounting clips already installed on the wire.
Do not reuse the old clips.
- Install wheel speed sensor
electrical connector (6).
- Install wheel speed sensor
mounting clip (2) to the frame rail.
- Install the wheel speed
sensor mounting clip (2) to the control arm.
- Install the hub and rotor. Refer to
Hub and Rotor Assembly Replacement
.
- Install brake caliper. Refer to
Brake Caliper Replacement
.
- Install tire and wheel. Refer to
Wheel Removal
.
Wheel Speed Sensor Replacement C 3500HD
Removal Procedure
- Raise vehicle.
- Remove tire and wheel. Refer to
Wheel Removal
.
- Remove brake caliper. Refer to
Brake Caliper Replacement
.
- Remove the hub and rotor. Refer to
Hub and Rotor Assembly Replacement
.
- Remove the splash shield
(1).
- Remove the wheel speed sensor wire mounting clip (6) attached
to the upper king pin cap.
- Wheel speed sensor wire
mounting clip (5) attached to the frame rail.
- Remove wheel speed sensor
cable electrical connector (1).
Important: It is not necessary to replace the sensor mounting bracket unless there
is visible damage or distortion to the mounting bracket.
- Remove the wheel speed sensor (3) from the mounting bracket (4).
Installation Procedure
NOTICE: The wheel speed sensor used on the C 3500HD 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.
- Install the wheel speed
sensor (3) to the mounting bracket (4).
- Install wheel speed sensor to bracket mounting nuts (5).
- Run down the nuts but do not torque. The wheel speed sensor must
remain loose and move along the slots in the bracket.
- Place the front hub and
rotor assembly on a flat surface with the tone wheel facing up. Take care
not to damage the wheel studs.
- Mark the position of the rotor relative to the hub so the rotor
can be installed in the same position later.
- Remove bolts (22) attaching the rotor (21) to the hub (14).
- Remove the rotor from the hub.
- Install the bearing seal (12) and inner bearing (20).
- Install hub and tone wheel assembly (14) on the knuckle spindle
(3), taking care not to damage the wheel speed sensor with the tone ring.
- Install the hub outer bearing (15), washer (16) and wheel bearing
nut (19).
Tighten
Wheel bearing nut (19) to 16 N·m(12 lb. ft.) while rotating the
hub (14) in either direction to ensure proper centering.
- Do not back off the wheel bearing nut.
NOTICE: 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
result in the correct air gap.
- Insert flexible shim stock
or equivalent between the tone wheel (1) and the wheel speed sensor (4).
- The thickness of the shim stock must be 1.5 mm (0.060 in.). The
length and width of the shim stock must be sufficient enough 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 speed sensor.
- Press the wheel speed sensor firmly against the shim stock and
tone wheel.
Notice: Use the correct fastener in the correct location. Replacement fasteners
must be the correct part number for that application. Fasteners requiring
replacement or fasteners requiring the use of thread locking compound or sealant
are identified in the service procedure. Do not use paints, lubricants, or
corrosion inhibitors on fasteners or fastener joint surfaces unless specified.
These coatings affect fastener torque and joint clamping force and may damage
the fastener. Use the correct tightening sequence and specifications when
installing fasteners in order to avoid damage to parts and systems.
- Use the following
procedure for tightening the WSS nuts
Tighten
- Tighten the left hand lower attaching nut to 13 N·m (10
lb. ft.).
- Tighten the left hand upper attaching nut to 13 N·m (10
lb. ft.).
- Tighten the right hand upper attaching nut to 13 N·m (10
lb. ft.).
- Tighten the right hand lower attaching nut to 13 N·m (10
lb. ft.) while holding the wheel speed sensor against the shim stock.
- Remove the shim stock
from between the tone wheel (1) and the wheel speed sensor (4).
- Inspect that the tone wheel does not contact the wheel speed sensor
when the hub and tone wheel are rotated. Readjust if necessary.
- Install the splash shield
(8) to the anchor plate (9).
- Take care to route the
wheel speed sensor wire (4) through the opening in the splash shield (1) near
the center mounting hole.
- Install three splash shield
mounting bolts.
Tighten
Tighten bolts to 17 N·m (13 lb. ft.)
- Route the wheel speed
sensor wire (4) between the splash shield (1) and the knuckle.
- Install the wheel speed sensor mounting clip (6) to the upper
king pin cap.
Tighten
Tighten the bolt (2) to 17N·m (13 lb. ft.).
- Install the wheel speed
sensor mounting clip (5) to the inside frame rail.
Tighten
Tighten the bolt (6) to 17N·m (13 lb. ft.).
- Connect the wheel speed
sensor cable electrical connector (1).
- Remove wheel hub and tone
wheel assembly (14) from the steering knuckle (3).
Important: Take care to line up reference position marks.
- Install hub rotor (29) to wheel hub (22).
- Install rotor to hub attaching bolts.
Tighten
Tighten bolts (22) to 237 N·m (175 lb. ft.).
- Install the hub (14) and rotor (21). Refer to
Hub and Rotor Assembly Replacement
.
- Install brake caliper (7). Refer to
Brake Caliper Replacement
.
- Install tire and wheel. Refer to
Wheel Installation
.