Master Cylinder Inspection
Disassemble the front and rear master cylinders (see
Master Cylinder Rubber Parts Replacement in the Peri-
odic Maintenance chapter).
Do not remove the secondary cup from the piston
since removal will damage it.
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 assy should be replaced to renew the cups.
If fluid leakage is noted at the brake lever, the piston assy
should be replaced to renew the cups.
Check the dust covers [E] for damage.
If they are damaged, replace them.
Check the piston return spring [F] for any damage.
If the springs are damaged, replace them.
Check that relief port [G] and supply port [H] are not
If the relief port becomes plugged, the brake pads will
drag on the disc. Blow the ports clean with compressed
Front Master Cylinder [J]
Rear Master Cylinder [K]