SANYANG INDUSTRY CO. SYM Service Manual page 134

SYM
Inspection
Check the master cylinder for damage or
scratch. Replace it if necessary.
Measure the cylinder inner diameter at several
points along both X and Y directions.
Replace the cylinder if the measured values
exceed allowable limit.
Allowable limit: 11.055 mm
Measure the outer diameter of the piston.
Replace the piston if its measured value
exceeds allowable limit.
Allowable limit: 10.945 mm
Assembly
CAUTION
It is necessary to replace the whole set
comprising piston, spring, piston cup,
and circlip.
Make sure there is no dust on all
components before assembling.
Apply clean brake fluid to the piston cup, and
then install the cup onto the piston.
Install the larger end of the spring onto the
master cylinder.
The master cup's cavity should be face inside
of master cylinder when installing the master
cup.
Install the circlip.
CAUTION
Never install cup lip in the opposite
direction.
Make sure the circlip is seated securely
in the groove.
Install the rubber pad into groove properly.
circlip
rubber boot
piston
rubber
spring
washer
13. BRAKE
master cylinder
Dial gauge
Piston
Micrometer
brake lamp
switch
master
cylinder
13-9