Hyundai Ioniq (AE): Brake System / Troubleshooting

Hyundai Ioniq (AE) 2017-2022 Service & Repair 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 Tool (Number and Name) Illustration Use 09581-2T100Piston expanderSpreading the front and rear disc brake piston.

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

    Other information:

    Hyundai Ioniq (AE) 2017-2022 Service & Repair Manual: A/C Pressure Transducer. Description and operation

    DescriptionThe A/C Pressure Transducer (APT) converts the pressure value of high pressure line into voltage value after measuring it. By converted voltage value, engine ECU controls the cooling fan by operating it high speed or low speed. Engine ECU stops the operation of the compressor when the temperature of refrigerant line is very high or very

    Hyundai Ioniq (AE) 2017-2022 Service & Repair Manual: Blower Motor. Repair procedures

    Inspection1.Connect the battery voltage and check the blower motor rotation.2.If the blower motor does not operate well, substitute with a known-good blower motor and check for proper operation.3.Replace the blower motor if it is proved that there is a problem with it.

    Categories

     
    Copyright © 2026 www.hioniqae.com - 0.0142