YG125-30A Maintenance Manual
Front wheel, front overhang and steering stem
114
For the damage form, fault symptom and repair method of front brake
Item
Damage form
Trouble symptom of
component
Trouble symptom of
motorcycle
Repair method
Front brake
main pump
assembly
brake 1iquid is
insufficient
brake liquid is
insufficient
brake lose effect
fill DOT4 to upper limit mark
dirty brake liquid
brake lose effect
Replace the brake fluid
surface of wall is
damaged
brake lose effect
wall is over worn
brake lose effect
replace main pump
oil case is cracked
oil leakage
brake lose effect
replace main pump
piston surface is
cracked
brake lose effect
replace main pump piston
piston is damaged
brake lose effect
replace main pump piston
Front brake
caliper
air entry into oil pipe
brake lose effect
exhaust front brake oil way
oil pipe is broken
oil leakage from oil
pipe
brake lose effect
replace oil pipe
front brake oil pipe is
clogged
oil pipe is clogged
brake lose effect
clean or replace oil pipe
wall is broken or cocked
brake lose effect
replace front brake caliper
wall is over worn
brake lose effect
replace front brake caliper
front brake caliper is
broken
oil leakage from front
brake caliper
lose effect
replace front break caliper
seal ring is broken or
worn
oil leakage
lose effect
replace front break caliper
friction plate is over
worn
lose effect
replace friction plate
completely
surface of piston is
damaged or worn
abnormal sound or
lose effect
replace brake caliper piston
guide pin is clipped
front break lose effect
or spring cannot be
returned
clean or lubricate guide pin
Front brake
disc
over worn(1ess than
limit value3mm)
front brake lose effect
replace front brake disc
distorted
abnormal sound or
lose effect
replace front brake disc
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