Usually, all that is wrong with my calipers is crud, abd cryastalized fluid behind the o ring. The ones I am messing with now, really don't need anything at all, except cleaning. Even the seals are reusable once cleaned. I have an old set with bad looking pistons.
Just looking at Bike Bandit (not the cheapest), I can but a "piston kit" for $21.70. This includes a new OEM piston and both seals. It does not include the two exterior boots (mine are good).
I had no idea that the rebuild kits are such a rip off, as far as content per dollar.
In the future, I will be looking a lot more closely at the OEM Fische and selecting what I need. The last rears I worked on would have been good with nothing but the seal between the calipers halvs, really.
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