Hyundai Ioniq: Brake System / Troubleshooting

Hyundai Ioniq (AE) 2017-2024 Service Manual / Brake System / Troubleshooting

Troubleshooting
Symptom
Suspect Area
Reference
Lower pedal or spongy pedal
1. Integrated Brake Actuation Unit (Air in)
air·bleed
2. AHB system (Fluid leaks)
replace
3. Piston seals in IBAU (Worn or damaged)
replace
Brake drag
1. Brake pedal free play (Minimum)
adjust
2. Pad or lining (Cracked or distorted)
replace
3. Piston (Stuck)
replace
4. Piston (Frozen)
replace
5. Anchor or Return spring (Inoperative)
replace
6. Master cylinder (Inoperative)
replace
7. IBAU (Inoperative)
replace
Brake pull
1. Piston (Sticking)
replace
2. Pad or lining (Oily)
replace
3. Piston (Frozen)
replace
4. Disc (Scored)
replace
5. Pad or lining (Cracked or distorted)
replace
Hard pedal but brake inefficient
1. Brake system (Fluid leaks)
repair
2. Brake system (Air in)
air·bleed
3. Pad or lining (Worn)
replace
4. Pad or lining (Cracked or distorted)
replace
5. Rear brake shoe clearance(Out of adjustment)
adjust
6. Pad or lining (Oily)
replace
7. Pad or lining (Glazed)
replace
8. Disc (Scored)
replace
9. IBAU (Inoperative)
replace
10. PSU (Inoperative)
replace
Noise from brake
1. Pad or lining (Cracked or distorted)
replace
2. Installation bolt (Loosen)
adjust
3. Disc (Scored)
replace
4. Sliding pin (Worn)
replace
5. Pad or lining (Dirty)
clean
6. Pad or lining (Glazed)
replace
7. Brake pad shim (Damage)
replace
Brake fades
1. Pad or lining (Worn)
replace
2. Master cylinder (Inoperative)
replace
Brake vibration, pulsation
1. Pedal free play
adjust
2. Master cylinder (Inoperative)
replace
3. Caliper (Damage)
replace
4. Master cylinder cap seal
replace
5. Damaged brake lines
replace
Heavey pedal
(Halt)
1. Brake pedal sticking (lack of grease)
repair
2. IBAU (Inoperative)
replace
Motor sounds and excessive time to braking  when consecutive 2 or 3 times pushing brake pedal
(In the case of that accumulator pressure increase rate is under 5bar/sec when checking sensor figures of AHB with GDS) 
1. AHB system (air in)
air·bleed
2. PSU (Inoperative)
replace
Excessive noise when pushing brake pedal
1. IBAU/PSU system (air in)
air·bleed

   
It is not the malfunction of brake when motor sound is noticed with followings.
Repeated pushing brake pedal
Pushing and releasing brake pedal with power off.
Opening a door of driver side
It is not the malfunction of brake while a brake pedal seems inoperative with followings.
Noise when pushing brake pedal fast
Noise when pushing brake pedal consecutively

    Special service tools

    Special Service Tools Tool (Number and Name) Illustration Use 09581-2T100Piston expanderSpreading the front and rear disc brake piston...

    Brake bleeding procedures

    Integrated Electronic Brake (IEB) System Air Bleeding Procedures    • Do not reuse the drained fluid.• Always use genuine DOT3 or DOT4 brake Fluid...

    Other information:

    Hyundai Ioniq (AE) 2017-2024 Service Manual: Trailing Arm. Repair procedures


    Removal1.Loosen the wheel nuts slightly.Raise the vehicle, and make sure it is securely supported.2.Remove the rear wheel and tire (A) from the rear hub. Tightening torque : 107.9 - 127.5 N.m (11.0 - 13.0 kgf.m, 79.6 - 94.0 lb-ft)    • Be careful not to damage the hub bolts when removing the rear wheel and tire (A)...

    Hyundai Ioniq (AE) 2017-2024 Owner's Manual: Disc Brake Wear Indicator


    When your brake pads are worn and new pads are required, you will hear a high pitched warning sound from your front or rear brakes. You may hear this sound come and go or it may occur whenever you depress the brake pedal. Note that some driving conditions or climates may cause a brake squeal when you first apply (or lightly apply) the brakes...

    Categories

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    Seat belt warning light

    Hyundai Ioniq. Seat Belt Warning Light

    As a reminder to the driver, the seat belt warning light will illuminate and warning chime will sound for approximately 6 seconds each time you place the Engine Start/Stop button to the ON position if the seat belt is unfastened.

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