Originally Posted by kwilford
Rebuilding rear wheel cylinders is fairly practical, UNLESS the pistons are corroded as they are hard to come by (they were at one time part of a standard rebuild kit, but not so much anymore), or if the cylinders themselves are pitted more than just slightly. From what is described above, those wheel cylinders are toast.
JM2CW
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Correct, you are.
Replacing the cups is best done as a preventive measure and not a corrective one, unless your pistons and wheel cylinder bore are in excellent shape.
Maybe someday someone will take a lathe and cut a bunch of wheel cylinder pistons someday. Of course as long as the wheel cylinders are still being sold new, there isn't really a need.