Symptom
| Possible Cause
| Remedy
|
Lower pedal or spongy pedal
| 1. Integrated Brake Actuation Unit (Air in system)
| Bleed air
|
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 (Stuck)
| 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)
| Bleed air
|
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 (Loose)
| 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 (Damaged)
| 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 (Damaged)
| Replace
|
4. Master cylinder cap seal
| Replace
|
5. Damaged brake lines
| Replace
|
Heavy pedal
(Halt)
| 1. Brake pedal stuck (Lack of grease)
| Repair
|
2. IBAU (Inoperative)
| Replace
|
Noisy electric motor and/or excessive braking force after 2 - 3 consecutive applications of brake pedal
(When accumulator pressure increase rate is below 5bar/sec when sensor data was inspected after connecting to AHB module)
| 1. AHB system (air in system)
| Bleed air
|
2. PSU(Inoperative)
| Replace
|
Excessive noise when pushing brake pedal
| 1. IBAU/PSU system (air in system)
| Bleed air
|
Special Service Tools
