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Park Brake System Diagnosis

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Park Brake System Diagnostic Test

Step Action Yes No
DEFINITION: This diagnostic table is designed to diagnose ONLY the components of the PARK brake system in order to determine if the PARK brake system is operating properly. You will be directed by the appropriate Symptom Table to go to other brake system diagnostic tables as appropriate.
1 Were you sent here from a Hydraulic Brake Symptom Table? Go to Step 4  Go to Step 2 
2 Were you sent here from a Park Brake Symptom Table? Go to Step 4  Go to Step 3 
3 Is the symptom related to the ability of the park brake system to hold and/or release? Go to Diagnostic Starting Point - Park Brake  Go to Diagnostic Starting Point - Hydraulic Brakes in Hydraulic Brakes
4
  1. Raise and support the vehicle with the rear axle supported by jack stands. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Shift the transmission into NEUTRAL.
  3. With the park brake RELEASED, attempt to rotate the rear wheels to check the rear brakes for a significant amount of drag.
Do the rear brakes have a significant amount of drag?		 Go to Step 11  Go to Step 5 
5
  1. Shift the transmission into NEUTRAL.
  2. Apply the park brake.
  3. Attempt to rotate the rear wheels to check the rear brakes for a significant amount of drag.
Do the rear brakes have a significant amount of drag?		 Go to Step 6  Go to Step 7 
6
  1. Release the park brake.
  2. Rotate the rear wheels to check the rear brakes for a significant reduction in the amount of drag.
Did the rear brakes exhibit a significant reduction in the amount of drag?		 Go to Step 20  Go to Step 11 
7 Visually check the park brake cable connections and the cables that are accessible on the UNDERSIDE of the vehicle for disconnections and/or damage.
Were any or the park brake cables disconnected and/or damaged?		 Go to Step 8  Go to Step 9 
8 Reconnect or replace the park brake cables as necessary. Refer to Park Brake Cable Replacement  .
Did you complete the repair and/or replacement?		 Go to Step 9  -
9 Check the adjustment of the park brake. Refer to Park Brake Adjustment  .
Was the park brake adjusted properly?		 Go to Step 11  Go to Step 10 
10 Adjust the park brake. Refer to Park Brake Adjustment  .
Were you able to attain adjustment of the park brake?		 Go to Step 16  Go to Step 11 
11
NOTE: Do not depress the brake pedal with the brake rotors and/or the brake drums removed, or with the brake calipers repositioned away from the brake rotors, or damage to the brake system may result.
  1. Remove the rear brake rotors. Refer to Brake Rotor Replacement - Rear in Disc Brakes.
  2. Inspect the park brake shoe hardware for looseness, damaged, broken or missing components.
  3. Check the park brake actuators for a seized condition.
Does the park brake hardware and/or the park brake actuators require replacement?		 Go to Step 12  Go to Step 13 
12
  1. Replace park brake hardware components as necessary. Refer to Park Brake Shoe Replacement  .
  2. Replace the park brake actuators as necessary. Refer to Park Brake Actuator Replacement  .
Did you complete the replacement?		 Go to Step 13  -
13 Have an assistant apply and release the park brake, while you observe the park brake cables for free movement.
Did the park brake cables move freely?		 Go to Step 14  Go to Step 17 
14 Check the adjustment of the park brake. Refer to Park Brake Adjustment  .
Was the park brake adjusted properly?		 Go to Step 16  Go to Step 15 
15 Adjust the park brake. Refer to Park Brake Adjustment  .
Were you able to attain adjustment of the park brake?		 Go to Step 16  Go to Step 25 
16
  1. With the transmission still in NEUTRAL, apply the park brake.
  2. Attempt to rotate the rear wheels to check the rear brakes for a significant amount of drag.
  3. Release the park brake.
  4. Rotate the rear wheels to check the rear brakes for a significant reduction of drag.
Did the park brake apply and release properly?		 Go to Step 27  Return to Symptom Table
17 Disconnect the park brake cable connections that are accessible on the UNDERSIDE of the vehicle one at a time and check each cable for free movement.
Do any of the park brake cables accessible on the underside of the vehicle require replacement?		 Go to Step 18  Go to Step 19 
18 Replace any of the park brake cables that do not have free movement (not releasing properly). Refer to Park Brake Cable Replacement  .
Did you complete the replacement?		 Go to Step 23  -
19 Replace the park brake pedal assembly (not releasing properly). Refer to Park Brake Lever Assembly Replacement  .
Did you complete the replacement?		 Go to Step 24  -
20 Check the adjustment of the park brake. Refer to Park Brake Adjustment  .
Is the park brake adjusted properly?		 Go to Step 27  Go to Step 21 
21 Adjust the park brake. Refer to Park Brake Adjustment  .
Were you able to attain adjustment of the park brake system?		 Go to Step 26  Go to Step 22 
22
  1. Remove the rear brake rotors, if they have not yet been removed. Refer to Brake Rotor Replacement - Rear in Disc Brakes.
  2. Check the park brake actuators for a seized condition.
  3. Replace the park brake actuators as necessary. Refer to Park Brake Actuator Replacement  .
Did you find and correct a condition?		 Go to Step 23  Go to Step 25 
23 Adjust the park brake. Refer to Park Brake Adjustment  .
Were you able to attain adjustment of the park brake system?		 Go to Step 26  Go to Step 25 
24 Adjust the park brake. Refer to Park Brake Adjustment  .
Were you able to attain adjustment of the park brake system?		 Go to Step 26  Return to Symptom Table
25
  1. Replace the component that is used to adjust the park brake system. Refer to Park Brake Lever Assembly Replacement  .
  2. Adjust the park brake. Refer to Park Brake Adjustment  .
Did you complete the replacement and adjustment?		 Go to Step 26  Return to Symptom Table
26
  1. With the transmission still in NEUTRAL, apply the park brake.
  2. Attempt to rotate the rear wheels to check the rear brakes for a significant amount of drag.
  3. Release the park brake.
  4. Rotate the rear wheels to check the rear brakes for a significant reduction of drag.
Did the park brake apply and release properly?		 Go to Step 27  Return to Symptom Table
27 Install or connect any components that were removed or disconnected during diagnosis.
Did you complete the operation?		 Park Brake System OK
Return to Symptom Table		 -
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