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Section 6
Component Replacement
Section 6Com ponent Replacement
WARNINGS
To prevent serious eye injury, always wear
safe eye protection when you perform vehicle
maintenance or service.
Block the wheels to prevent the vehicle from
moving. Support the vehicle with safety stands.
Do not work under a vehicle supported only by
jacks. Jacks can slip and fall over. Serious personal
injury can result.
The ABS is an electrical system. When you
work on the ABS, take the same precautions that
you must take with any electrical system to avoid
serious personal injury. As with any electrical
system, the danger of electrical shock or sparks
exists that can ignite flammable substances. You
must always disconnect the battery ground cable
before working on the electrical system.
Disconnect power from the ECU/Valve Assembly
before you remove any components. Failure to
disconnect power from the ECU can cause faults
to be recorded and stored in ECU memory.
Use the following procedures to avoid damage to
the electrical system and ABS components.
When welding on an ABS-equipped vehicle is
necessary, disconnect the power connector from
the ECU.
Wheel Speed Sensor
How to Remove a Sensor
1. Follow the vehicle manufacturer's instructions
to back off the slack adjuster and remove the
tire, wheel and drum.
2. Hold the sensor, not the cable, and use a
twisting motion to pull the sensor out of its
mounting block.
3. Remove the spring clip from the
mounting block.
4. Remove any fasteners that hold the sensor
cable to other components.
5. Disconnect the sensor cable from the
extension cable.
How to Install a Sensor
Sensor locations vary according to suspension
types. Typically, a spring suspension has sensors
on the forward axle, and an air suspension has
sensors on the rear axle.
1. Apply a mineral oil-based grease that contains
molydisulfide to the sensor spring clip and to
the body of the sensor. The grease must be
anti-corrosive and contain adhesive properties
that will continuously endure temperatures
from –40° to 300°F (–40° to 150°C).
2. Push the spring clip into the sensor holder
from the inboard side, until the spring clip tabs
are against the sensor holder. Push the sensor
into the spring clip as far as possible. Refer to
Figure 6.1 .
3. Route the sensor cable toward the brake
chamber, over the brake spider, and behind the
axle. Secure the cable to the axle between the
brake spider and the suspension brackets.
Continue to route the sensor cable behind the
spring seats. Secure the cable to the axle one
inch from the molded sensor plug. Refer to
Figure 6.2 .
Figure 6.1
1 Sensor Holder
2 Spring Clip
3 Spring Clip Tab
4 Sensor
Figure 6.2
1 Sensor Cable
SENSOR
HOLDER
SPRING
CLIP
SPRING
CLIP TAB
SENSOR
1002100b
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