Lexus ES manuals

Lexus ES: 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)

READ NEXT:

 Brake System (for Hv Model)

 On-vehicle Inspection

ON-VEHICLE INSPECTION CAUTION / NOTICE / HINT NOTICE: DTCs may be stored during the inspection procedure. Be sure to clear the DTCs and check that no DTCs are output after the inspection is finished.

 Precaution

PRECAUTION CAUTION: While the auxiliary battery is connected, even if the power switch is off, the brake control system activates when the brake pedal is depressed or the door courtesy switch is turne

SEE MORE:

 Removal

REMOVAL CAUTION / NOTICE / HINT The necessary procedures (adjustment, calibration, initialization or registration) that must be performed after parts are removed and installed, or replaced battery removal/installation are shown below. Necessary Procedures After Parts Removed/Installed/Replace

 ABS Warning Light Remains ON

DESCRIPTION This procedure is for troubleshooting when the ABS warning light remains on but no DTCs are output. The skid control ECU (brake actuator assembly) controls the ABS warning light in the combination meter assembly via CAN communication. CAUTION / NOTICE / HINT NOTICE: After replacing th

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