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# Kia Soul EV: Brake System / Troubleshooting

Kia Soul EV (PS EV) 2015-2020 Service Manual / Brake System / Troubleshooting

Troubleshooting

Symptom | Possible Cause | Remedy
Lower pedal or spongy pedal | 1. Integrated Brake Actuation Unit (Air in system) | Bleed air
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 (Stuck) | 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) | Bleed air
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 (Loose) | 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 (Damaged) | 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 (Damaged) | Replace
4. Master cylinder cap seal | Replace
5. Damaged brake lines | Replace
Heavy pedal (Halt) | 1. Brake pedal stuck (Lack of grease) | Repair
2. IBAU (Inoperative) | Replace
Noisy electric motor and/or excessive braking force after 2 - 3 consecutive applications of brake pedal (When accumulator pressure increase rate is below 5bar/sec when sensor data was inspected after connecting to AHB module) | 1. AHB system (air in system) | Bleed air
2. PSU(Inoperative) | Replace
Excessive noise when pushing brake pedal | 1. IBAU/PSU system (air in system) | Bleed air

The following operations may generate brake motor sound which is considered normal:
– | Repeated pushing on brake pedal
– | Pushing and releasing brake pedal during power off
– | Opening driver side door
The following cases are normal although the brake pedal may seem abnormal:
– | Noise when brake pedal is abruptly pushed
– | Noise when brake pedal is consecutively pushed

##### Special Service Tools

Special Service Tools Tool Name / NumberIllustrationDescription09581-11000Piston expanderUsed when spreading the front and rear disc brake piston.09580-3D100Air bleeding toolUsed when bleeding t ...

##### AHB(Active Hydraulic Boost) System

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##### Other information:

### Kia Soul EV (PS EV) 2015-2020 Service Manual: Main Fuse Specifications

Specification ItemSpecificationRated Voltage (V)450 (DC)Rated Current (A)250 (DC) ItemSpecificationRemarkSafety Plug Cable Resistance (?)Less than 1 (20°C)Checkable by multi testerMain Fuse Resistance (?)Less than 1 (20°C)Checkable by multi tester ...

### Kia Soul EV (PS EV) 2015-2020 Service Manual: Center Pillar Trim Components and Components Location

Component Location 1. Center pillar lower trim2. Center pillar upper trim ...
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