Service Information; Troubleshooting - KYMCO Mongoose/KXR 250 Service Manual

13
. BRAKE SYSTEM

SERVICE INFORMATION

GENERAL INSTRUCTIONS
• During servicing, keep oil or grease off the brake pads and brake disk.
• Drain the brake fluid from the hydraulic brake system before disassembly.
• Contaminated brake disk or brake pads reduce stopping power. Clean the contaminated brake
disk with high-performance brake degreaser and replace the brake pads.
• Do not use brake fluid for cleaning.
• Bleed air from the brake system if the brake system is removed or the brake is soft.
• Do not allow any foreign matters entering the brake reservoir when filling the brake reservoir
with brake fluid.
• Brake fluid will damage painted, coated surfaces and plastic parts. When working with brake
fluid, use shop towels to cover and protect painted, rubber and plastic parts. Wipe off any splash
of brake fluid with a clean towel. Do not wipe the machine with a towel contaminated by brake
fluid.
• Make sure to use recommended brake fluid. Use of other unspecified brake fluids may cause
brake failure.
• Inspect the brake operation before riding.
SPECIFICATIONS
Brake disk thickness
Brake disk runout

TROUBLESHOOTING

Loose brake lever
• Air in hydraulic brake system
• Brake fluid level too low
• Hydraulic brake system leakage
Poor brake performance
• 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
Item Standard (mm)
3.8～4.2
⎯
Tight brake lever
•Seized piston
•Clogged hydraulic brake system
•Smooth or worn brake pad
Brake noise
•
Contaminated brake pad surface
•
Excessive brake disk run out
•
Incorrectly installed caliper
•
Brake disk or wheel not aligned
Hard braking
•Seized hydraulic brake system
•Seized piston
Mongoose/KXR 250
Service Limit (mm)
3.0
0.30
13-2