If a master cylinder or piston shows any damage, replace them.

If a cup is worn, damaged softened (rotted), or swollen, the piston assembly should be replaced to renew the cups.
If fluid leakage is noted at the brake lever, the piston assembly should be replaced to renew the cups.
If they are damaged, replace them.
If the springs are damaged, replace them.
If the relief port becomes plugged, the brake pads will drag on the disc. Blow the ports clean with compressed air.
Front Master Cylinder [I] Rear Master Cylinder [J]

Rear Master Cylinder Installation
Brake DiscChain Slack Adjustment
Remove the cotter pin, and loosen
the axle nut.
Loosen the left and right chain adjuster
locknuts.
A. Axle Nut
B. Cotter Pin
C. Adjuster
D. Locknut
If the chain is too loose, turn out the
left and right chain adjusters evenly.
If the chain is too tight, turn in the left
...
KIBS Warning Indicator Light (For models equipped
with KIBS)
The yellow warning indicator light in
the meter unit functions as the KIBS
warning indicator light. The yellow
warning indicator light and warning
symbol “KIBS” go on if there is a malfunction
in the KIBS system. When the
warning light is on, the KIBS system
stops functioning. However, th ...
Check 3-7 Stop Watch Inspection
Connect the leads in the same circuit as Check 3-2.
By pushing the upper button each time to set the stop
watch mode.
Connect the insulated auxiliary lead processed insulation
to the terminal [13] as shown in the figure, then stop watch
start to count.
While count the stop watch, conn ...