Troubleshooting - Sym PA12B Service Manual

10. Brake System

Troubleshooting

Disk Brake
Soft brake lever
1. Air inside the hydraulic system
2. Hydraulic system leakage
3. Worn master cylinder piston
4. Worn brake pad
5. Poor brake caliper
6. Worn brake disk
7. Low brake fluid
8. Blocked brake hose
9. Warped / bent brake disk
10. Bent brake lever
Hard brake lever operation
1. Blocked brake system
2. Poor brake caliper
3. Blocked brake hose
4. Seized / worn master cylinder piston
5. Bent brake lever
Drum Brake
Insufficient brake
1. Incorrect brake adjustment
2. Worn brake shoe
3. Worn wheel hub
4. Worn brake cam
5. Incorrect brake shoe installation
6. Jammed or interfered brake pedal
7. Contaminated brake shoe
8. Contaminated wheel hub
9. Worn brake shoe / cam contact face
10. Improper brake arm / cam contact face
10-4
To this chapter contents
Uneven brake
1. Dirty brake pad / disk
2. Poor wheel alignment
3. Clogged brake hose
4. Deformed or warped brake disk
5. Restricted brake hose and fittings
Tight brake
1. Dirty brake pad / disk
2. Poor wheel alignment
3. Deformed or warped brake disk
Brake noise
Dirty brake pad / disk
1.
Deformed brake disk
2.
Poor brake caliper installation
3.
Imbalanced brake disk / wheel
4.
Tight brake pedal
1. Worn or damaged brake arm return spring
2. Worn wheel hub
3. Contaminated brake shoe
4. Contaminated wheel hub
5. Jammed or interfered brake pedal
6. Worn brake cam
7. Incorrect brake shoe installation
Brake noise
1. Worn brake shoe
2. Worn wheel hub
3. Contaminated brake shoe
4. Contaminated wheel hub