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 master cylinder sub-assembly (faulty)

Brake booster push rod (adjustment necessary)

Parking brake actuator O-ring

Brake drag

Brake pedal free play (insufficient)

Parking brake actuator

Front disc brake pad (cracked or distorted)

Rear disc brake pad (cracked or distorted)

Front brake piston (stuck)

Rear brake piston (stuck)

Front brake piston (seized)

Rear brake piston (seized)

Vacuum leaks in booster system

Brake master cylinder sub-assembly (faulty)

Brake booster push rod (adjustment necessary)

Brake pull

Front brake piston (stuck)

Rear brake piston (stuck)

Front disc brake pad (oily)

Rear disc brake pad (oily)

Front brake piston (seized)

Rear brake piston (seized)

Front disc (scored)

Rear disc (scored)

Front disc brake pad (cracked or distorted)

Rear disc brake pad (cracked or distorted)

Hard pedal but braking inefficient

Fluid leaks in brake system

-

Air in brake system

Front disc brake pad (worn)

Rear disc brake pad (worn)

Front disc brake pad (cracked or distorted)

Rear disc brake pad (cracked or distorted)

Front disc brake pad (oily)

Rear disc brake pad (oily)

Front disc brake pad (glazed)

Rear disc brake pad (glazed)

Front disc (scored)

Rear disc (scored)

Vacuum leaks in booster system

Noise from brakes

Front disc brake pad (cracked or distorted)

Rear disc brake pad (cracked or distorted)

Front disc brake cylinder mounting bolt (loose)

Rear disc brake cylinder mounting bolt (loose)

Front disc (scored)

Rear disc (scored)

Front disc brake pad support plate (loose)

Rear disc brake pad support plate (loose)

Front disc brake cylinder slide pin (worn)

Rear disc brake cylinder slide pin (worn)

Front disc brake pad (dirty)

Rear disc brake pad (dirty)

Front disc brake pad (glazed)

Rear disc brake pad (glazed)

Front brake anti-squeal shim (damaged)

Rear brake anti-squeal shim (damaged)

    Precaution

    Brake System(for Hv Model)

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