Toyota Avalon Service & Repair Manual: Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

HINT:

Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.

Symptom

Suspected Area

Link

Low or spongy pedal

Fluid leaks in brake system

-

Air in brake system

Front brake piston seals (worn or damaged)

Rear brake piston seals (worn or damaged)

Brake booster with master cylinder assembly (faulty)

Parking brake actuator O-ring

Brake drag

Brake pedal free play (insufficient)

Parking brake actuator

Front brake pad (cracked or distorted)

Rear brake pad (cracked or distorted)

Front brake piston (stuck)

Rear brake piston (stuck)

Front brake piston (seized)

Rear brake piston (seized)

Brake booster with master cylinder assembly (faulty)

Brake pull

Front brake piston (stuck)

Rear brake piston (stuck)

Front brake pad (oily)

Rear brake pad (oily)

Front brake piston (seized)

Rear brake piston (seized)

Front disc (scored)

Rear disc (scored)

Front brake pad (cracked or distorted)

Rear brake pad (cracked or distorted)

Hard pedal but brake inefficient

Front brake pad (worn)

Rear brake pad (worn)

Front brake pad (cracked or distorted)

Rear brake pad (cracked or distorted)

Front brake pad (oily)

Rear brake pad (oily)

Front brake pad (glazed)

Rear brake pad (glazed)

Front brake piston (stuck)

Rear brake piston (stuck)

Front brake piston (seized)

Rear brake piston (seized)

Front disc (scored)

Rear disc (scored)

Noise from brakes

Front brake pad (cracked or distorted)

Rear brake pad (cracked or distorted)

Front brake cylinder mounting bolt (loose)

Rear brake cylinder mounting bolt (loose)

Front disc (scored)

Rear disc (scored)

Front brake pad support plate (loose)

Rear brake pad support plate (loose)

Front disc brake cylinder slide pin (worn)

Rear disc brake cylinder slide pin (worn)

Front brake pad (dirty)

Rear brake pad (dirty)

Front brake pad (glazed)

Rear brake pad (glazed)

Front brake anti-squeal shim (damaged)

Rear brake anti-squeal shim (damaged)

    Precaution

    Brake Vacuum Hose(for Gasoline Model)

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