KIA Niro: Troubleshooting - Brake System

Symptom :

Symptom :

Lower pedal or sponge pedal

Expected cause Countermeasure

  • Brake system (oil leakage) Repair
  • Brake system (air inflow) Air bleeding out procedure
  • Piston seal (worn out or damaged) Replace

Symptom :

Dragged brake

Expected cause Countermeasure

  • Brake pedal free separation (minimum) Adjust
  • Parking brake cable length (adjustment trouble) Adjust
  • Parking brake cable (trapped) Repair
  • Pad and lining (twisted or cracked) Replace
  • Piston (trapped) Replace
  • Piston (frozen) Replace
  • Anker or return spring (malfunction) Replace
  • IBAU (Inoperative) Replace

Symptom :

Uneven brake

Expected cause Countermeasure

  • Piston (trapped) Replace
  • Pad and lining (oil stain, cracked or twisted) Replace

Symptom :

Heavy pedal and brake trouble

Expected cause Countermeasure

  • Brake system (oil leakage, air inflow) Perform air bleeding procedure
  • Pad or lining (worned out) Replace
  • Pad or lining (cracked or twisted) Replace
  • Rear brake shoe separation (adjustment trouble) Adjust
  • Pad or lining (oil stain) Replace
  • Pad or lining (slippery)  Replace
  • Disc (scratched) Replace
  • IBAU or PSU (Inoperative) Repair

Symptom :

Noise from brake

Expected cause Countermeasure

  • Pad or lining (cracked or twisted) Replace
  • Looseness of wheel bolt and caliper Adjust
  • Pad sliding trouble (Pad uneven worn out) Replace
  • Pad or lining (dirty) Cleaning
  • Pad or lining (slippery) Pad replacement
  • Anker or return spring (malfunction) Replace
  • Brake pad shim (damaged) Replace
  • Hold down spring (damaged) Replace
  • Foreign substance stucked between disc and pad Cleaning
  • Corrosion on disc  Test drive brake and cleaning * get rid of corrosion by friction while test drive brake
  • Caved disc Replace

Symptom :

Not fully functioning on brake (when drive speed is fast)

Expected cause Countermeasure

  • Pad or lining (worned out) Replace

Symptom :

Brake vibration

Expected cause Countermeasure

  • Pedal free separation Adjust
  • Damaged on master cylinder cap Replace
  • Damaged on brake line Replace
  • Caliper returning trouble (while tire is turning, check the noise) Replace
  • Transformed disc Replace

Warning

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

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