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Park Brake System Diagnosis

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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 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 21  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 the following procedures as necessary:
Did you complete the repair and/or replacement?		 Go to Step 9  -
9 Check the adjustment of the park brake. Refer to Parking Brake Adjustment (1500 Without JNC) .
Was the park brake adjusted properly?		 Go to Step 11  Go to Step 10 
10 Adjust the park brake. Refer to Parking Brake Adjustment (1500 Without JNC) .
Were you able to attain adjustment of the park brake?		 Go to Step 16  Go to Step 11 
11
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 (1500 Series) , Rear Brake Rotor Replacement (2500 Series) .
  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 Replace the park brake actuators as necessary. Refer to Parking Brake Actuator Replacement (2500 Series) , Parking Brake Actuator Replacement (1500 Series) .
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 Parking Brake Adjustment (1500 Without JNC) .
Was the park brake adjusted properly?		 Go to Step 16  Go to Step 15 
15 Adjust the park brake. Refer to Parking Brake Adjustment (1500 Without JNC) .
Were you able to attain adjustment of the park brake?		 Go to Step 16  Go to Step 26 
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 28  Go to Symptoms - Park Brake 
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 the following procedures as necessary:
Did you complete the replacement?		 Go to Step 19  -
19
  1. Disconnect the front park brake cable connection accessible INSIDE the vehicle at the park brake pedal assembly and check for free movement.
  2. Replace the front park brake cable if it does not have free movement. Refer to Parking Brake Lever Pedal Assembly Replacement .
Did you find and correct a condition?		 Go to Step 24  Go to Step 20 
20 Replace the park brake pedal assembly (not releasing properly). Refer to Parking Brake Lever Pedal Assembly Replacement .
Did you complete the replacement?		 Go to Step 25  -
21 Check the adjustment of the park brake. Refer to Parking Brake Adjustment (1500 Without JNC) .
Is the park brake adjusted properly?		 Go to Step 28  Go to Step 22 
22 Adjust the park brake. Refer to Parking Brake Adjustment (1500 Without JNC) .
Were you able to attain adjustment of the park brake system?		 Go to Step 27  Go to Step 23 
23
  1. Remove the rear brake rotors, if they have not yet been removed. Refer to Rear Brake Rotor Replacement (1500 Series) , Rear Brake Rotor Replacement (2500 Series) .
  2. Check the park brake actuators for a seized condition.
  3. Replace the park brake actuators as necessary. Refer to Parking Brake Actuator Replacement (2500 Series) , Parking Brake Actuator Replacement (1500 Series) .
Did you find and correct a condition?		 Go to Step 24  Go to Step 26 
24 Adjust the park brake. Refer to Parking Brake Adjustment (1500 Without JNC) .
Were you able to attain adjustment of the park brake system?		 Go to Step 27  Go to Step 26 
25 Adjust the park brake. Refer to Parking Brake Adjustment (1500 Without JNC) .
Were you able to attain adjustment of the park brake system?		 Go to Step 27  Go to Symptoms - Park Brake 
26
  1. Replace the component that is used to adjust the park brake system. Refer to Parking Brake Lever Pedal Assembly Replacement .
  2. Adjust the park brake. Refer to Parking Brake Adjustment (1500 Without JNC) .
Did you complete the replacement and adjustment?		 Go to Step 27  Go to Symptoms - Park Brake 
27
  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 28  Go to Symptoms - Park Brake 
28 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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