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	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 9	Go to Step 5
5	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 19	Go to Step 6
6	Visually inspect 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: IMPORTANT: The park brake pedal and front park brake cable are serviced as an assembly. Park Brake Pedal Assembly Replacement Park Brake Cable Replacement - Right Rear Park Brake Cable Replacement - Left Rear Did you complete the repair and/or replacement?	Go to Step 19	-
8	Inspect 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 19	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. Remove the rear brake drums. Refer to Brake Drum Replacement . If equipped with drum brakes, inspect the park brake for looseness, damaged, broken or missing lever return spring. Inspect the park brake lever for a seized condition. Does the park brake lever require replacement?	Go to Step 10	Go to Step 11
10	Replace the park brake lever. Refer to Brake Shoe Replacement . Did you complete the replacement?	Go to Step 19	-
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	Inspect 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 19	Go to Step 13
13	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 19	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 inspect 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: IMPORTANT: The park brake pedal and front park brake cable are serviced as an assembly. Park Brake Pedal Assembly Replacement Park Brake Cable Replacement - Right Rear Park Brake Cable Replacement - Left Rear Did you complete the replacement?	Go to Step 19	-
16	Disconnect the park brake release handle assembly cable connection from the park brake pedal assembly and inspect for free movement. Replace the park brake release handle assembly if the release cable does not have free movement. Refer to Park Brake Release Cable Replacement . Did you find and correct a condition?	Go to Step 19	Go to Step 17
17	Inspect the park brake pedal for proper operation and replace if necessary. Refer to Park Brake Pedal Assembly Replacement . Did you find and correct a condition?	Go to Step 19	Go to Step 18
18	Replace the component that is used to adjust the park brake system. Refer to Park Brake Cable Equalizer Replacement . Adjust the park brake. Refer to Park Brake Adjustment . Did you complete the replacement and adjustment?	Go to Step 19	Go to Symptoms - Park Brake
19	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	-