Service Manual — page 442 of 715

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12-20 BRAKES
Master Cylinder
Master Cylinder Inspection (Visual Inspection)
• Remove   the master cylinders (see Front/Rear Master
  Cylinder Removal).
• Disassemble  the front and rear master cylinders (see
  Master Cylinder Rubber Parts Replacement in the Peri-
    odic Maintenance chapter).
•   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
    them.
•   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
    cups.
    If fluid leakage is noted at the brake lever, the piston as-
    sembly should be replaced to renew the cups.
•   Check the dust covers [E] for damage.
    If they are damaged, replace them.
•   Check the piston return springs [F] for any damage.
    If the springs are damaged, replace them.
•   Check that relief port [G] and supply port [H] are not
    plugged.
    If the relief port becomes plugged, the brake pads will
    drag on the disc. Blow the ports clean with compressed
    air.
      Front Master Cylinder [J]
      Rear Master Cylinder [K]