| 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 Symptoms - 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
- Contaminated linings
- Aftermarket linings
- Glazed 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 Symptoms - 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 |