KIA Niro: Troubleshooting - Brake System

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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