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 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	Raise and support the vehicle with the rear axle supported by jack stands. Refer to Lifting and Jacking the Vehicle . Shift the transmission into NEUTRAL. 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	Shift the transmission into NEUTRAL. Apply the park brake. 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 17	Go to Step 5
5	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 6	Go to Step 7
6	Reconnect or replace the park brake cables as necessary. Refer to the following procedures as necessary: Parking Brake Intermediate Cable Replacement Parking Brake Rear Cable Replacement - Left Side (All Wheel Drive) , Parking Brake Rear Cable Replacement - Left Side (Front Wheel Drive) Parking Brake Rear Cable Replacement - Right Side (All Wheel Drive) , Parking Brake Rear Cable Replacement - Right Side (FWD) Did you complete the repair and/or replacement?	Go to Step 17	-
7	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 17	Go to Step 8
8	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. Remove the rear brake rotors. Refer to Rear Brake Rotor Replacement . Inspect the park brake shoe hardware for looseness, damaged, broken or missing components. 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 9	Go to Step 10
9	Replace park brake hardware components as necessary. Refer to Parking Brake Shoe Replacement . Replace the park brake actuators as necessary. Refer to Parking Brake Actuator Replacement . Did you complete the replacement?	Go to Step 17	-
10	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 11	Go to Step 13
11	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 17	Go to Step 12
12	With the transmission still in NEUTRAL, apply the park brake. Attempt to rotate the rear wheels to check the rear brakes for a significant amount of drag. Release the park brake. 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 17	Go to Symptoms - Park Brake
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: Parking Brake Intermediate Cable Replacement Parking Brake Rear Cable Replacement - Left Side (All Wheel Drive) , Parking Brake Rear Cable Replacement - Left Side (Front Wheel Drive) Parking Brake Rear Cable Replacement - Right Side (All Wheel Drive) , Parking Brake Rear Cable Replacement - Right Side (FWD) Did you complete the replacement?	Go to Step 17	-
15	Inspect the electronic parking brake control module for proper operation and replace as necessary. Refer to Electronic Parking Brake Control Module Replacement . Did you find and correct the condition?	Go to Step 17	Go to Step 16
16	Replace the component that is used to adjust the park brake system. Refer to Electronic Parking Brake Control Module Replacement . Adjust the park brake. Refer to Parking Brake Adjustment . Did you complete the replacement and adjustment?	Go to Step 17	Go to Symptoms - Park Brake
17	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