Park Brake System Diagnosis (Drum Brakes)

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	Raise and support the vehicle with the rear axle supported by jack stands. Refer to Lifting and Jacking the Vehicle . 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	Apply the park brake. Attempt to rotate the rear wheels to check the rear brakes for a significant amount of drag. Did the rear brakes exhibit a significant reduction in the amount of drag?	Go to Step 6	Go to Step 7
6	Release the park brake. 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 16	Go to Step 9
7	Remove the brake drums. Refer to Brake Drum Replacement . 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	-
8	Reconnect or replace the park brake cables as necessary. Refer to Parking Brake Cable Replacement (Mechanical Parking Brake) . Did you complete the repair?	Go to Step 11	-
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. Remove the brake drums. Refer to Brake Drum Replacement . Inspect the park brake hardware for loose, damaged, broken or missing components. Check the drum brake adjusters for a condition. Does the park brake hardware and/or the park brake adjusters require replacement?	Go to Step 10	Go to Step 11
10	Replace park brake hardware components as necessary. Refer to Brake Shoe Replacement . Replace the drum brake adjusting hardware as necessary. Refer to Drum Brake Adjusting Hardware Replacement . Did you complete the replacement?	Go to Step 11	-
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 13
12	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 18	Return to Symptom Table
13	Remove the brake drums. Refer to Brake Drum Replacement . 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 Parking Brake Cable Replacement (Mechanical Parking Brake) . Did you complete the replacement?	Go to Step 17	Return to Symptom Table
15	Replace the park brake lever assembly - not releasing properly. Refer to Parking Brake Lever Replacement . Did you complete the replacement?	Go to Step 17	-
16	Remove the brake drums. Refer to Brake Drum Replacement . Check the drum brake adjusters for a seized condition. Replace the drum brake adjusting hardware as necessary. Refer to Drum Brake Adjusting Hardware Replacement . Did you find and correct a condition?	Go to Step 17	-
17	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 18	Return to Symptom Table
18	Install or connect any components that were removed or disconnected during diagnosis. Did you complete the operation?	Park Brake System OK Return to Symptom Table	Return to Symptom Table