Personally, when it comes to brakes and the time that can be spent trying to remedy a problem cylinder, I just put on brand new. Besides my personal collection, I also maintain a fleet here at the museum. I have not rebuilt a wheel cylinder since I came here....always brand new. It's cheaper than the labour and far,far more dependable.
The only time I actually even dis-assemble a master cylinder is when I am converting M35 master cylinders for use on M135s. A check valve has to be removed to make them work on that application.
In my experience, a rebuilt master gets you about 4 years, and a new one 7 years or better.
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