Hyundai Ioniq (AE): 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.
It is not the malfunction of brake while a brake pedal seems inoperative with followings.
|
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 • Do not reuse the drained fluid.• Always use genuine DOT3 or DOT4 brake Fluid.
Other information:
Hyundai Ioniq (AE) 2017-2022 Service & Repair Manual: In-car Sensor. Description and operation
DescriptionThe In-car air temperature sensor is built in the heater & A/C control unit.The sensor contains a thermistor which measures the temperature of the inside. The signal decided by the resistance value which changes in accordance with perceived inside temperature, is delivered to heater control unit and according to this signal the contr
Hyundai Ioniq (AE) 2017-2022 Service & Repair Manual: Intake Actuator. Specifications
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