|The MGA With An Attitude
Brake Cylinder HONE - TS-122
General procedure for rebuilding any hydraulic cylinder is, disassemble, hone the bore until smooth, clean thoroughly, and reassemble with new seals. A brake hone is very cheap, likely under $10, and may save you LOTS of money in replacement parts.
See Hydraulic Tech HT-205 for detals on rebuilding hydraulic cylinders.