Step
| Action
| 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
| Go to
Diagnostic Starting Point - Hydraulic Brakes
|
2
|
- 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 |
- Adjust, repair or replace components as necessary. Refer to
Disc Brake System Diagnosis.
Did you find and correct a condition?
| Go to
Step 9
| Go to
Step 3
|
3
|
- 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 |
- Adjust, repair or replace components as necessary. Refer to
Brake Assist System Diagnosis.
Did you find and correct a condition?
| Go to
Step 9
| Go to
Step 4
|
4
|
- Inspect the hydraulic brake system for the following conditions.
| • | Improper operation of caliper pistons |
| • | Contaminated brake fluid |
- Adjust, repair or replace components as necessary. Refer to
Hydraulic Brake System Diagnosis.
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 9
|
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 9
|
7
|
- Clean and inspect the park brake shoes for excessive wear and/or damage.
- Inspect the drum portion of the rotors for excessive wear, blueing discoloration, heat spots, and excessive radial runout.
- If any of these conditions are present, replace the affected components.
- 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
| Go to
Diagnostic Starting Point - Hydraulic Brakes
|
9
|
- Install or connect components that were removed or disconnected during diagnosis.
- 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
|
