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Home >> GMC >> 2017 >> Canyon SL >> Repair and Diagnosis >> Brakes >> Parking Brake System >> Diagnostic Information and Procedures >> Park Brake System Diagnosis

Park Brake System Diagnosis

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 Symptoms - Park Brake  Go to Symptoms - Hydraulic Brakes
4
  1. Raise and support the vehicle with the rear axle supported by jack stands. Refer to 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 9  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 18  Go to Step 6 
6 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 7  Go to Step 8 
7 Reconnect or replace the park brake cables as necessary. Refer to the following procedures as necessary:
Did you complete the repair and/or replacement?		 Go to Step 18  -
8 Check the adjustment of the park brake and adjust as necessary. Refer to Parking Brake Adjustment .
Did you find and correct the condition?		 Go to Step 18  Go to Step 9 
9
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. Refer to Rear Brake Rotor Replacement .
  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 10  Go to Step 11 
10 Replace park brake hardware components as necessary. Refer to Parking Brake Shoe Replacement .
Did you complete the replacement?		 Go to Step 18  -
11 With the aid of an assistant, apply and release the parking brake while observing the cables for free movement.
Do the park brake cables move freely?		 Go to Step 12  Go to Step 14 
12 Check the adjustment of the park brake and adjust as necessary. Refer to Parking Brake Adjustment .
Did you find and correct the condition?		 Go to Step 18  Go to Step 13 
13
  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 18  Go to Symptoms - Park Brake 
14 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 15  Go to Step 16 
15 Replace any of the park brake cables that do not have free movement (not releasing properly). Refer to the following procedures as necessary:
Did you complete the replacement?		 Go to Step 18  -
16 Inspect the park brake control module for proper operation and replace as necessary. Refer to Parking Brake Control Module Replacement .
Did you find and correct the condition?		 Go to Step 18  Go to Step 17 
17
  1. Replace the component that is used to adjust the park brake system. Refer to Parking Brake Control Module Replacement .
  2. Adjust the park brake. Refer to Parking Brake Adjustment .
Did you complete the replacement and adjustment?		 Go to Step 18  Go to Symptoms - Park Brake 
18 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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