3-8 TROUBLESHOOTING
BRAKES
Complaint Symptom and possible causes Remedy
Insufficient brake
power
• Leakage of brake fluid from hydraulic system
• Worn pads
• Oil adhesion of engaging surface of pads
• Worn disc
• Air in hydraulic system
• Not enough brake fluid in the reservoir
Repair or replace
Replace
Clean disc and pads
Replace
Bleed air
Replenish
Brake squeaking • Carbon adhesion on pad surface
• Tilted pads
• Worn pads
• Damaged wheel bearings
• Loosen front wheel axle or rear wheel axle
• Foreign material in brake fluid
• Clogged return port of master cylinder
Repair surface with
sandpaper
Correct pad fitting or
replace
Replace
Replace
Tighten to specified torque
Replace brake fluid
Disassemble and clean
master cylinder
Excessive brake
lever stroke
• Air in hydraulic system
• Insufficient brake fluid
• Improper quality of brake fluid
Bleed air
Replenish fluid to specified
level; bleed air
Replace with correct fluid
Leakage of brake
fluid
• Insufficient tightening of connection joints
• Cracked brake hose
• Worn piston or seal
• Worn cylinder or cup
Tighten to specified torque
Replace
Replace piston or seal
Replace cylinder or cup
Brake drags • Rusty part
• Insufficient brake lever or brake pedal pivot lubrica-
tion
Clean and lubricate
Lubricate
To Next Page
Loading...
