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Brake System Noise

Brake System Noise


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 - Vehicle
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

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

2. 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

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

2. 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

1. Inspect the hydraulic brake system for the following conditions.

Improper operation of caliper pistons

Contaminated brake fluid

2. 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

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 Go to Diagnostic Starting Point - Vehicle
9

1. Install or connect components that were removed or disconnected during diagnosis.

2. 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