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4D-4 Parking Brake:
Park Brake System Diagnosis
Step
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?
2
Were you sent here from a Park Brake Symptom table?
Is the symptom related to the ability of the park brake system
3
to hold and/or release?
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.
4
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?
1. Apply the park brake.
2. Attempt to rotate the rear wheels to check the rear brakes
5
for a significant amount of drag.
Do the rear brakes have a significant amount of drag?
Visually inspect the park brake cable connections and the
cables that are accessible on the UNDERSIDE of the vehicle
6
for disconnections and/or damage.
Were any of the park brake cables disconnected and/or
damaged?
Reconnect or replace the park brake cables as necessary.
Refer to the following procedures as necessary:
7
• "Parking Brake Front Cable Replacement"
• "Parking Brake Rear Cable Replacement"
Did you complete the repair and/or replacement?
Check the adjustment of the park brake. Refer to "Park Brake
8
Adjustment".
Did you find and correct the condition?
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.
9
1. Remove the rear brake rotors. Refer to "Rear Brake Rotor
Replacement: ".
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?
1. Replace park brake hardware components as necessary.
Refer to"Park Brake Shoe Replacement".
10
2. Replace the park brake actuators as necessary. Refer to
"Parking Brake Actuator Replacement".
Did you find and correct the condition?
Have an assistant apply and release the park brake, while you
11
observe the park brake cables for free movement.
Did the park brake cables move freely?
Action
Yes
Go to Step 4
Go to Step 4
Go to "Diagnostic
Go to "Diagnostic
Starting Point - Park
Brake"
Hydraulic Brakes: "
Go to Step 9
Go to Step 19
Go to Step 7
Go to Step 19
Go to Step 19
Go to Step 10
Go to Step 19
Go to Step 12
No
Go to Step 2
Go to Step 3
Starting Point -
Go to Step 5
Go to Step 6
Go to Step 8
—
Go to Step 9
Go to Step 11
Go to Step 18
Go to Step 14
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Table of Contents
Troubleshooting
