BRAKE SYSTEM (OTHER): BRAKE SYSTEM (for Gasoline Model): PROBLEM SYMPTOMS TABLE; 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019

Last Modified: 07-31-2024	6.11:8.1.0	Doc ID: RM100000001GP2M
Model Year Start: 2020	Model: GR Corolla	Prod Date Range: [01/2019 - 09/2022]
Title: BRAKE SYSTEM (OTHER): BRAKE SYSTEM (for Gasoline Model): PROBLEM SYMPTOMS TABLE; 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]

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) *a
	Rear brake piston seals (worn or damaged) *b
	Brake master cylinder sub-assembly (faulty)
	Parking brake actuator O-ring *a
Brake drag	Brake pedal free play (insufficient)
	Parking brake lever travel (out of adjustment) *b
	Parking brake cable (sticking) *b
	Parking brake actuator *a
	Front disc brake pad (cracked or distorted)
	Rear disc brake pad (cracked or distorted) *a
	Rear disc brake pad (cracked or distorted) *b
	Front brake piston (stuck)
	Rear brake piston (stuck) *a
	Rear brake piston (stuck) *b
	Front brake piston (seized)
	Rear brake piston (seized) *a
	Rear brake piston (seized) *b
	Vacuum leaks in booster system
	Brake master cylinder sub-assembly (faulty)
Brake pull	Front brake piston (stuck)
	Rear brake piston (stuck) *a
	Rear brake piston (stuck) *b
	Front disc brake pad (oily)
	Rear disc brake pad (oily) *a
	Rear disc brake pad (oily) *b
	Front brake piston (seized)
	Rear brake piston (seized) *a
	Rear brake piston (seized) *b
	Front disc (scored)
	Rear disc (scored) *a
	Rear disc (scored) *b
	Front disc brake pad (cracked or distorted)
	Rear disc brake pad (cracked or distorted) *a
	Rear disc brake pad (cracked or distorted) *b
Hard pedal but braking inefficient	Fluid leaks in brake system	-
	Air in brake system
	Front disc brake pad (worn)
	Rear disc brake pad (worn) *a
	Rear disc brake pad (worn) *b
	Front disc brake pad (cracked or distorted)
	Rear disc brake pad (cracked or distorted) *a
	Rear disc brake pad (cracked or distorted) *b
	Front disc brake pad (oily)
	Rear disc brake pad (oily) *a
	Rear disc brake pad (oily) *b
	Front disc brake pad (glazed)
	Rear disc brake pad (glazed) *a
	Rear disc brake pad (glazed) *b
	Front disc (scored)
	Rear disc (scored) *a
	Rear disc (scored) *b
	Vacuum leaks in booster system
Noise from brakes	Front disc brake pad (cracked or distorted)
	Rear disc brake pad (cracked or distorted) *a
	Rear disc brake pad (cracked or distorted) *b
	Front disc brake cylinder mounting bolt (loose)
	Rear disc brake cylinder mounting bolt (loose) *a
	Rear disc brake cylinder mounting bolt (loose) *b
	Front disc (scored)
	Rear disc (scored) *a
	Rear disc (scored) *b
	Front disc brake pad support plate (loose)
	Rear disc brake pad support plate (loose) *a
	Rear disc brake pad support plate (loose) *b
	Front disc brake cylinder slide pin (worn)
	Rear disc brake cylinder slide pin (worn) *a
	Rear disc brake cylinder slide pin (worn) *b
	Front disc brake pad (dirty)
	Rear disc brake pad (dirty) *a
	Rear disc brake pad (dirty) *b
	Front disc brake pad (glazed)
	Rear disc brake pad (glazed) *a
	Rear disc brake pad (glazed) *b
	Front brake anti-squeal shim (damaged)
	Rear brake anti-squeal shim (damaged) *a
	Rear brake anti-squeal shim (damaged) *b

*a: w/ Electric Parking Brake

*b: w/o Electric Parking Brake