13. REAR WHEEL/SWING ARM/ HYDRAULIC BRAKE Mongoose/KXR 90/50 TROUBLESHOOTING Rear wheel wobbling Poor brake performance (Drum Brake) · Bent rim · Brake not adjusted properly · Faulty tire · Worn brake linings · Axle not tightened properly · Worn brake shoes at cam contacting area · Worn brake cam Soft rear shock absorber · Worn brake drum · Weak shock absorber spring · Faulty damper Loose brake lever (Disk Brake) Tight brake lever (Disk Brake) · Air in hydraulic brake system ·Seized piston · Brake fluid level too low ·Clogged hydraulic brake system · Hydraulic brake system leakage ·Smooth or worn brake pad Hard braking (Disk Brake) Poor brake performance (Disk Brake) · Seized hydraulic brake system Contaminated brake pad surface · Seized piston Brake noise (Disk Brake) · Contaminated brake pad surface · Excessive brake disk run out · Incorrectly installed caliper · Brake disk or wheel not aligned Poor brake performance (Disk Brake) · Air in brake system · Deteriorated brake fluid · Contaminated brake pads and brake disk · Worn brake pads · Worn brake master cylinder piston oil seal · Clogged brake fluid line · Deformed brake disk · Unevenly worn brake caliper 13-3