Step
|
Action
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Yes
|
No
|
DEFINITION: Vehicle exhibits abnormal noise when braking; vehicle
may exhibit abnormal noise during motion just after brake pedal
release.
|
1
|
Were you sent here from the Hydraulic Brake Symptom table?
|
Go to Step 2
|
-
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2
|
|
1. |
Inspect the disc brake system for the following
conditions. |
| • |
Lining wear indicator contact with rotor |
| • |
Debris trapped between rotor and splash shield or
backing plate; and/or debris trapped between rotor and linings |
| • |
Distorted, cracked or damaged linings |
| • |
Excessively worn linings |
| • |
Damaged or excessively worn caliper hardware
and/or lining hardware |
| • |
Incorrectly installed, loose or missing caliper
hardware and/or lining hardware |
| • |
Lack of lubrication or excessive corrosion on
metal to metal contact surfaces |
| • |
Bent or damaged splash shield or backing
plate |
| • |
Hard spots, heat checks, blueing discoloration of
rotor friction surfaces |
| • |
Glazed rotor friction surfaces |
| • |
Bent or damaged caliper or mounting component |
Did you find and correct a condition?
|
Go to Step 9
|
-
|
3
|
|
1. |
Inspect the brake assist system for the following
conditions. |
| • |
Lack of lubrication or excessively worn pushrod or
pedal pivots or pivot bushings |
| • |
Bent or damaged pedal pushrod, pedal, or pedal
bracket |
| • |
Damaged or improperly operating vacuum booster
and/or check valve, if equipped |
| • |
Low power steering fluid level, if equipped with
hydraulic boost |
| • |
Improperly tensioned, excessively worn or damaged
power steering belt, if equipped with hydraulic boost |
| • |
Restricted return hose from hydraulic booster, if
equipped |
| • |
Improperly operating hydraulic booster, if
equipped |
| • |
Improperly functioning power steering system, if
equipped with a hydraulic booster assembly |
| • |
Contaminated power steering fluid, if equipped
with hydraulic boost |
Did you find and correct a condition?
|
Go to Step 9
|
Go to Step 4
|
4
|
|
1. |
Inspect the hydraulic brake system for the
following conditions. |
| • |
Improper operation of wheel cylinder pistons, if
equipped |
| • |
Improper operation of caliper pistons |
| • |
Contaminated brake fluid |
Did you find and correct a condition?
|
Go to Step 9
|
Go to Step 5
|
5
|
Is the vehicle equipped with a drum-in-rotor type of park brake
system?
|
Go to Step 6
|
Go to Step 8
|
6
|
Ensure the park brake shoes are not adjusted too tightly, possibly
causing a noise under certain conditions.
Are the park brake shoes adjusted too tightly?
|
Go to Step 7
|
Go to Step 8
|
7
|
|
1. |
Clean and inspect the park brake shoes for
excessive wear and/or damage. |
|
2. |
Inspect the drum portion of the rotors for
excessive wear, blueing discoloration, heat spots, and excessive
radial runout. |
|
3. |
If any of these conditions are present, replace
the affected components. |
|
4. |
Adjust the park brake system. |
Did you find and correct a condition?
|
Go to Step 9
|
Go to Step 8
|
8
|
Inspect the park brake system for proper operation. Refer to
Park Brake System Diagnosis .
Did you find and correct a condition?
|
Go to Step 9
|
-
|
9
|
|
1. |
Install or connect components that were removed or
disconnected during diagnosis. |
Is the condition still present?
|
Go to Step 2
|
System OK
|
