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Home >> Cadillac >> 2021 >> XT5 Sport >> Repair and Diagnosis >> External Pages >> Different car >> Section 800 (Parking Brake) >> Diagnostic Information and Procedures >> Park Brake System Diagnosis

Park Brake System Diagnosis

WARNING: This page is about a different car, the 2023 GMC Sierra 3500 HD and 2023 GMC Sierra 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
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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 3  Go to Step 2 
2 Were you sent here from a Park Brake Symptom Table? Go to Step 3  Go to Diagnostic Starting Point - Vehicle
3
  1. Raise and support the vehicle. Lifting and Jacking the Vehicle
  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 8  Go to Step 4 
4
  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 10  Go to Step 5 
5 Check the adjustment of the park brake and adjust as necessary. Parking Brake Adjustment 
Did you find and correct the condition?		 Go to Step 10  Go to Step 6 
6
CAUTION:

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. Rear Brake Rotor Replacement (SRW) , or Rear Brake Rotor Replacement (DZW)
  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 7  Go to Step 8 
7
  1. Replace park brake hardware components as necessary. Parking Brake Shoe Replacement (SRW) , or Parking Brake Shoe Replacement (DZW) 
  2. Replace the park brake actuators as necessary. Parking Brake Actuator Replacement 
Did you complete the replacement?		 Go to Step 10  -
8 Check the adjustment of the park brake and adjust as necessary. Parking Brake Adjustment 
Did you find and correct the condition?		 Go to Step 10  Go to Step 9 
9
  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 10  Go to Symptoms - Park Brake 
10 Install or connect any components that were removed or disconnected during diagnosis.
Did you complete the operation?		 Park Brake System OK Go to Symptoms - Park Brake 
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