Component Tests and General Diagnostics

Park Brake System Diagnosis

Diagnostic Starting Point - Park Brake
Begin the system diagnosis by reviewing the system description and operation. Reviewing the description and operation information will help you determine the correct symptom diagnostic procedure when a malfunction exists. Reviewing the description and operation information will also help you determine if the condition described by the customer is normal operation. Refer to Symptoms - Park Brake Symptom Related Diagnostic Procedures in order to identify the correct procedure for diagnosing the system and where the procedure is located.

Symptoms - Park Brake

Important: Review the system operation in order to familiarize yourself with the system functions. Refer to Park Brake System Description and Operation.

Visual/Physical Inspection
^ Inspect for aftermarket devices which could affect the operation of the park brake system.
^ Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnosis the symptom:

Refer to Park Brake Will Not Hold Park Brake Will Not Hold or Park Brake Will Not Release Park Brake Will Not Release.

Steps 25 - 28:

Park Brake System Diagnosis

Park Brake Shoe Inspection

Caution: Refer to Brake Dust Caution in Service Precautions.

1. Raise and suitably support the vehicle.
2. Remove the rear brake rotor.
3. Inspect and replace the park brake shoe and lining if any of the following conditions are found:
^ Excessive wear indicated by the park brake lining being worn down to the shoe
^ Brake lining cracking
^ Oil or fluid contamination
4. Adjust the park brake shoes if necessary. Refer to Park Brake Adjustment.
5. Install the rear brake rotor.
6. Lower the vehicle.