Master Cylinder Assembly
Before assembly, clean all parts including the master
cylinder with brake fluid or alcohol.
Except for the disc pads and disc, use only disc
brake fluid, isopropyl alcohol, or ethyl alcohol for
cleaning of the brake parts. Do not use any other
fluid for cleaning of these parts, Gasoline, engine
oil, or any other petroleum distillate will cause de-
terioration of the rubber parts. Oil spilled on any
part will be difficult to wash off completely, and will
eventually deteriorate the rubber used in the disc
Apply brake fluid to the removed parts and to the inner
wall of the cylinder.
Take care not to scratch the piston or the inner wall of the
Apply silicone grease (ex. PBC grease)
Brake Lever Pivot Bolt
Brake Lever Pivot Contact
Push Rod Contact (Rear)
Torque - Brake Lever Pivot Bolt: 1.0 N·m (0.10 kgf·m, 9
Brake Lever Pivot Bolt Locknut: 5.9 N·m (0.60
kgf·m, 52 in·lb)
Master Cylinder Inspection
Remove the master cylinders (see Brakes chapter).
Disassemble the front and rear master cylinders.
Check that there are no scratches, rust or pitting on the
inner wall [A] of each master cylinder and on the outside
of each piston [B].
If a master cylinder or piston shows any damage, replace
Inspect the primary cup [C] and secondary cup [D].
If a cup is worn, damaged softened (rotted), or swollen,
the piston assembly should be replaced to renew the
If fluid leakage is noted at the brake lever, the piston as-
sembly should be replaced to renew the cups.
Front Master Cylinder [J]