Check that there are no scratches, rust or pitting on the inner wall of each master cylinder [A] and on the outside of each piston [В].
★ If a master cylinder or piston shows any damage, replace them.
Inspect the primary [C] and secondary [D] cups.
★ 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.
Check the dust covers [E] for damage.
★ If they are damaged, replace them.
Check that relief [F] and supply [G] ports are not plugged.
★ If the relief port becomes plugged, the brake pads will drag on the disc. Blow the ports clean with compressed air.
Check the piston return springs [H] for any damage.
★ if the springs are damaged, replace them.
