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Chevrolet Silverado / GMC Sierra. Manual - part 2670
Inspect for aftermarket devices which could affect the operation of the park brake system.
Inspect the easily accessible or visible system components for obvious damage or conditions
which could cause the symptom.
Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the
symptom:
Park Brake Will Not Hold or Release
PARK BRAKE WILL NOT HOLD OR RELEASE
PARK BRAKE SYSTEM DIAGNOSIS
Step
Action
Yes
No
1
Were you sent here from the Park Brake
Symptom table?
Go to Step 2
Go to Diagnostic
Starting Point -
Park Brake
2
Inspect the park brake system for proper
operation. Refer to Park Brake System
Diagnosis.
Did you find and correct a condition?
Go to Step 5
Go to Step 3
3
Inspect the disc brake system for proper
operation. Refer to Disc Brake System
Diagnosis .
Did you find and correct a condition?
Go to Step 5
Go to Step 4
4
Inspect the hydraulic brake system for proper
operation. Refer to Hydraulic Brake System
Diagnosis .
Did you find and correct a condition?
Go to Step 5
Go to Diagnostic
Starting Point -
Park Brake
5
Road test the vehicle in order to confirm proper
operation. Refer to Brake System Vehicle
Road Test .
Is the condition still present?
Go to Step 2
System OK
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.
2008 Chevrolet Silverado 1500
2008 BRAKES Park Brake - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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. Shift the transmission into NEUTRAL.
2. Apply the park brake.
3. 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 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
Reconnect or replace the park brake cables as
necessary. Refer to the following procedures as
necessary:
2008 Chevrolet Silverado 1500
2008 BRAKES Park Brake - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
7
Parking Brake Lever Pedal Assembly
Replacement
(The front park brake cable and the park
brake pedal are replaced as an assembly.)
Parking Brake Intermediate Cable
Replacement (JD9, JF3, JF7)
Parking Brake Rear Cable
Replacement - Left Side (JF3, JF7) or
Parking Brake Rear Cable
Replacement - Left Side (JD9)
Parking Brake Rear Cable
Replacement - Right Side (JF3, JF7) or
Parking Brake Rear Cable
Replacement - Right Side (JD9)
Did you complete the repair and/or
replacement?
Go to Step 19
-
8
Check the adjustment of the park brake and
adjust as necessary. Refer to Park Brake
Adjustment (Drum Brake) or Park Brake
Adjustment (Disc Brake).
Did you find and correct the condition?
Go to Step 19
Go to Step 9
9
1. Remove the rear brake rotors. Refer to
Rear Brake Rotor Replacement (JD9)
or Rear Brake Rotor Replacement
(JH6) or Rear Brake Rotor
Replacement (JH7) .
2. Inspect the park brake shoe hardware for
looseness, damaged, broken or missing
components.
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.
2008 Chevrolet Silverado 1500
2008 BRAKES Park Brake - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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 Parking Brake
Shoe Replacement (JD9) or Parking
Brake Shoe Replacement (JH6, JH7).
2. Replace the park brake actuators as
necessary. Refer to Parking Brake
Actuator Replacement (JD9).
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
Check the adjustment of the park brake and
adjust as necessary. Refer to Park Brake
Adjustment (Drum Brake) or Park Brake
Adjustment (Disc Brake).
Did you find and correct the condition?
Go to Step 19
Go to Step 13
13
1. With the transmission still in NEUTRAL,
apply the park brake.
2. Attempt to rotate the rear wheels to check
the rear brakes for a significant amount of
drag.
3. Release the park brake.
4. 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 check each cable for
free movement.
2008 Chevrolet Silverado 1500
2008 BRAKES Park Brake - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Content .. 2668 2669 2670 2671 ..