Toyota Avalon (XX50): Brake System(for Gasoline Model)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Brake / Brake System (other) / Brake System(for Gasoline Model)

Precaution

PRECAUTION

NOTICE:

This vehicle is equipped with an SRS (Supplemental Restraint System). Failure to carry out service operations in the correct sequence could cause the SRS to unexpectedly deploy during servicing. This may cause a serious accident. Before servicing (including inspection, replacement, removal, and installation of parts), be sure to read the precautionary notices for the Supplemental Restraint System.
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Care must be taken to replace each part properly as it could affect the performance of the brake system and result in a driving hazard. Replace the parts with those having the same part number or equivalent.
It is very important to keep parts and the area clean when repairing the brake system.
If the vehicle is equipped with a mobile communication system, refer to the precautions in the Introduction section.
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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)

Brake Pedal(for Hv Model)

Brake System(for Hv Model)

See More:

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Electronically Controlled Brake System(for Gasoline Model): Diagnosis System. Diagnostic Trouble Code Chart. Dtc Check / Clear
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