Where are you getting the replacement clutch masters from?
If you're getting it from the neighborhood auto parts store, beware of inferior "rebuilt" / "remanufacturered" units.
A lot of these cheapie reman units have very bad quality control.
If you want to check, disassemble them and check the bore smoothness.
If they are bad, the bore will be pitted, and this will eat any new seals in a jiffy.
-Ted
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