Soft Brake Lever; Hard Operation Of Brake; Tight Brake; Brake Noise - Sym JET 4 R 50 Series Service Manual

12. Brake System
Troubleshooting
Disc Brake

Soft brake lever

1. Air inside the hydraulic
system
2. Hydraulic system leaking
3. Worn master piston
4. Worn brake pad
5. Poor brake caliper
6. Worn brake lining/disc
7. Low brake fluid
8. Blocked brake pipe
9. Warp/bent brake disc
10. Bent brake lever
Drum Brake
Poor brake performance
1. Improper brake adjustment
2. Worn brake lining
3. Worn brake drum
4. Worn brake cam
5. Improper brake lining
installation
6. Seized brake cable
7. Dirty brake lining
8. Dirty brake drum
9. Brake pad worn in brake
cam area.
10. Poor contact between brake
arm and camshaft indent
12-4

Hard operation of brake

lever
1. Blocked brake system
2. Poor brake caliper
3. Blocked brake pipe
4. Seized/worn master cylinder
piston
5. Bent brake lever
Uneven brake
1. Dirty brake lining/disc
2. Poor wheel alignment
3. Clogged brake hose
4. Deformed or warped brake
disc
5. Restricted brake hose and
fittings
Tight operation or low
return speed of brake lever
1. Worn/broken/crack return
spring
2. Worn drum
3. Dirty brake lining
4. Brake seized caused from
dirty brake drum
5. Seized brake cable
6. Worn brake cam
7. Improper brake lining
installation

Tight brake

1. Dirty brake lining/disc
2. Poor wheel alignment
3. Deformed or warped brake
disc

Brake noise

1. Dirty lining
2. Deformed brake disc
3. Poor brake caliper
installation
4. Imbalance brake disc or
wheel
Brake noise
1. Worn brake lining
2. Worn drum
3. Dirty brake lining
4. Dirty brake drum