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 ...
See also:
Schematic Diagrams
System Block Diagram
Component Parts And Function Outline
Component part
Function
Vehicle speed sensor
Converts vehicle speed to pulse.
...
TPMS Receiver Description and Operation
Description
It automatically searches the sensor location and learns new sensors.
It uses the sensor information, distance travelled,
indistinct noise, automatic learning status, vehicle battery ...
Turn Signal Lamp Repair procedures
Removal
Door Mirror Turn Signal Lamp
1.
Disconnect the negative (-) battery terminal.
2.
Remove the mirror (C) after disconnecting the heater connector (A) and BSD warning connector (B).
3 ...
Special Service Tools