Kia Optima: 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.
|
–
|
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 |
|
Special Service Tools
Tool Name / NumberIllustrationDescription09581-11000Piston expanderUsed when spreading the front and rear brake piston.09580-3D100Air bleeding toolUsed when bleeding the ai ...
Special Service Tools