Quote:
Originally Posted by Maki
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I've always wanted to try this experiment: lay the caliper so the piston is face up, pry the boot off and pour a small amount of a rust converter like Oxy-Solv into the space between the piston and bore and let it work overnight. It sure would be easier than removing the piston and cleaning up the rust by hand.
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You might - just might - kill the rust that way but there is no way you'll clean it out. You'll be leaving junk in there that would most likely score or damage the piston and caliper surfaces accelerating the demise of the caliper.
A bit of fun for a Sunday - sure - but don't fit it to a car.