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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 Diagnostic Starting Point - Park Brake  Go to Diagnostic Starting Point - 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. Apply the park brake.
  2. 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 20  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 20  -
8 Check the adjustment of the park brake. Refer to Park Brake Adjustment .
Was the park brake adjusted properly?		 Go to Step 20  Go to Step 9 
9
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 Rear Brake Rotor Replacement (Except Dual Wheels) or Rear Brake Rotor Replacement (W/Dual Wheels) .
  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
  1. Replace park brake hardware components as necessary. Refer to Park Brake Shoe Replacement (1500 Series)  or Park Brake Shoe Replacement (2500, 3500 Series) .
  2. Replace the park brake actuators as necessary. Refer to Parking Brake Actuator Replacement .
Did you complete the replacement?		 Go to Step 20  -
11 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 12  Go to Step 14 
12 Check the adjustment of the park brake. Refer to Park Brake Adjustment .
Did you find and correct the condition?		 Go to Step 20  Go to Step 13 
13 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 14  Go to Step 15 
14 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 20  -
15
  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 Front Cable Replacement .
Did you find and correct a condition?		 Go to Step 20  Go to Step 16 
16
  1. Disconnect the park brake release handle assembly cable connection from the park brake pedal assembly and check for free movement.
  2. Replace the park brake release handle assembly if the release cable does not have free movement. Refer to Park Brake Release Handle Assembly Replacement .
Did you find and correct a condition?		 Go to Step 20  Go to Step 17 
17 Inspect the park brake pedal assembly for proper operation and replace if necessary. Refer to Park Brake Pedal Assembly Replacement .
Did you find and correct the condition?		 Go to Step 20  Go to Step 18 
18 Check the adjustment of the park brake and adjust if necessary. Refer to Park Brake Adjustment .
Did you find and correct the condition?		 Go to Step 20  Go to Step 19 
19
  1. Replace the component that is used to adjust the park brake system. Refer to Park Brake Cable Equalizer Replacement .
  2. Adjust the park brake. Refer to Park Brake Adjustment .
Did you complete the replacement and adjustment?		 Go to Step 20  Go to Symptoms - Park Brake 
20
  1. Install or connect any components that were removed or disconnected during diagnosis.
  2. Verify the operation of the park brake system.
Does the park brake operate correctly?		 System OK Go to Symptoms - Park Brake 
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