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Step
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Action
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Yes
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No
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DEFINITION: Vehicle exhibits abnormal noise when braking; vehicle may exhibit abnormal noise during motion just after brake pedal release.
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1
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Were you sent here from the Hydraulic Brake Symptom table?
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Go to
Step 2
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Go to
Diagnostic Starting Point - Vehicle
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2
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1.
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Inspect the disc brake system for the following conditions.
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Lining wear indicator contact with rotor
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Debris trapped between rotor and splash shield or backing plate; and/or debris trapped between rotor and linings
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Distorted, cracked or damaged linings
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Excessively worn linings
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Damaged or excessively worn caliper hardware and/or lining hardware
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Incorrectly installed, loose or missing caliper hardware and/or lining hardware
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Lack of lubrication or excessive corrosion on metal to metal contact surfaces
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Bent or damaged splash shield or backing plate
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Hard spots, heat checks, blueing discoloration of rotor friction surfaces
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Glazed rotor friction surfaces
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Bent or damaged caliper or mounting component
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Did you find and correct a condition?
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Go to
Step 9
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Go to
Step 3
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3
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1.
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Inspect the brake assist system for the following conditions.
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Lack of lubrication or excessively worn pushrod or pedal pivots or pivot bushings
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Bent or damaged pedal pushrod, pedal, or pedal bracket
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Damaged or improperly operating vacuum booster and/or check valve, if equipped
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Low power steering fluid level, if equipped with hydraulic boost
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Improperly tensioned, excessively worn or damaged power steering belt, if equipped with hydraulic boost
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Restricted return hose from hydraulic booster, if equipped
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Improperly operating hydraulic booster, if equipped
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Improperly functioning power steering system, if equipped with a hydraulic booster assembly
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Contaminated power steering fluid, if equipped with hydraulic boost
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Did you find and correct a condition?
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Go to
Step 9
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Go to
Step 4
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4
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1.
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Inspect the hydraulic brake system for the following conditions.
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Improper operation of caliper pistons
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Contaminated brake fluid
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Did you find and correct a condition?
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Go to
Step 9
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Go to
Step 5
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5
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Is the vehicle equipped with a drum-in-rotor type of park brake system?
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Go to
Step 6
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Go to
Step 9
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6
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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?
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Go to
Step 7
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Go to
Step 9
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7
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1.
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Clean and inspect the park brake shoes for excessive wear and/or damage.
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2.
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Inspect the drum portion of the rotors for excessive wear, blueing discoloration, heat spots, and excessive radial runout.
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3.
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If any of these conditions are present, replace the affected components.
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4.
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Adjust the park brake system.
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Did you find and correct a condition?
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Go to
Step 9
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Go to
Step 8
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8
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Inspect the park brake system for proper operation. Refer to
Park Brake System Diagnosis
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Did you find and correct a condition?
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Go to
Step 9
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Go to
Diagnostic Starting Point - Vehicle
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9
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1.
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Install or connect components that were removed or disconnected during diagnosis.
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Is the condition still present?
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Go to
Step 2
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System OK
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