Repair kits are available for all Master Cylinder bore sizes. Kit contents are detailed below.

INSTRUCTIONS:
1) Remove rubber boot (11) and circlip (13).
2) Carefully remove internal components.
3) Replace the following. (making sure all mseals have been lubricated with brake fluid). Primary seal (1), slydring Bearing (2) Piston Washer (4) D-Ring Piston Seal (5) and the O-Ring End Cap Seal (9). (Care must be taken when assembling seals as damage maybe caused).
4) Check bore is free from debris.
5) Lubricate bore with brake fluid.
6) Re-assemble internal components into body.
7) Use new circlip (13) to secure internal components and new boot to protect from debris (11).