Kia Soul EV Owner's Manual Quiz
Brake System

Troubleshooting

In this manual: Brake System
General Information — 17Maintenance — 17Drive Shaft and Axle — 15Suspension System — 36Steering — 24Restraints — 48Brake System — 37Body (Interior and Exterior) — 207Body Electrical System — 203Heating, Ventilation, and Air Conditioning — 80Electric Vehicle Battery System — 115
~2min read

Troubleshooting

Symptom Possible Cause Remedy
Low or Spongy Pedal 1. Integrated brake actuator (air in system) Bleed Air
2. AHB system (fluid leak) 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 deformed) Replace
3. Piston (stuck) Replace
4. Piston (seized) Replace
5. Anchor or return spring (not working) Replace
6. Master cylinder (not working) Replace
7. IBAU (not working) Replace
Brake linkage 1. Piston (stuck) Replace
2. Gasket or lining (greasy) Replace
3. Piston (seized) Replace
4. Disc (scored) Replace
5. Pad or lining (cracked or deformed) Replace
Hard Pedal, but Brakes Are Ineffective 1. Brake system (fluid leak) Repair
2. Brake system (air) Bleed Air
3. Pad or lining (worn) Replace
4. Pad or lining (cracked or deformed) Replace
5. Rear brake shoe clearance (not adjusted) Adjust
6. Gasket or lining (greasy) Replace
7. Shim or Pad (Glazed) Replace
8. Disc (Rated) Replace
9. IBAU (Malfunction) Replace
10. Power Supply (Malfunction) Replace
Brake noise 1. Pad or Lining (Cracks or Deformation) Replace
2. Mounting bolt (loose) Adjust
3. Disc (Rated) Replace
4. Guide Pin (Worn) Replace
5. Shim or Pad (Dirty) Clean
6. Shim or Pad (Glazed) Replace
7. Brake pad shim (damaged) Replace
Brake fading 1. Pad or Lining (Worn) Replace
2. Master Cylinder (Malfunction) Replace
Brake Vibration, Pulsation 1. Brake Pedal Free Play Adjust
2. Master Cylinder (Malfunction) Replace
3. Caliper (damaged) Replace
4. Master Cylinder Cap Seal Replace
5. Brake Lines Damaged. Replace
Hard Pedal
(Stopping)		 1. Brake pedal sticking (lack of lubrication) Repair
2. IBAU (Malfunction) Replace
Noisy motor and/or excessive brake force after 2-3 consecutive brake pedal presses
(When the accumulator pressure build-up rate is below 5 bar/sec, when sensor data was checked after connecting to the AHB module)		 1. AHB system (air in system) Bleed Air
2. Power Supply (Malfunction) Replace
Excessive Noise When Depressing the Brake Pedal 1. IBAU/PSU system (air in system) Bleed Air

The following operations may produce a motor sound from the brake, which is considered normal:
  • Repeated Brake Pedal Depression
  • Pressing and releasing the brake pedal with the power off
  • Opening the Driver's Door
The following cases are normal, although the brake pedal may feel abnormal:
  • Noise When Depressing the Brake Pedal Suddenly
  • Noise When Depressing the Brake Pedal in Succession

Test yourself

A quick Kia Soul EV Owner's Manual quiz: every answer comes with an explanation and a link to the manual page.