Sym RS-50 Service Manual page 101

11. BRAKE SYSTEM
Master Cylinder 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: 12.550 mm
Measure the outer diameter of the piston.
Replace the piston if its measured value
exceeds allowable limit.
Allowable limit: 12.654 mm
Master Cylinder Assembly
Caution
It is necessary to replace the whole set
comprising piston, spring, piston cup, and
cir clip.
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 cir clip.
Caution
Never install cup lip in the opposite
direction.
Make sure the cir clip is seated securely in
the groove.
Install the rubber pad into groove properly.
11-8
This chapter Contents
Master cylinder
Piston
Rubber
bush
Cir clip
Piston
Micrometer
Sub-cup
Sub-cup
Spring
Master cylinder
Cylinder gauge