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Inside a Spit OEM overhauled caliper and pistons after 4 years 20k


Benjamin Swatton

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Took off the calipers I overhauled about 4 year ago 20k miles using DOT 4. The chrome piston's were of unknown aged all had corrosion pitted and one was seized the fourth piston i used was what thought at time was a stainless piston and now looked awfully corroded but had not seized. The caliper itself inside is totally rust free impresive considering I never changed fluid since overhaul -all corrosion is outside of seal.  However after de rusting the "stainless" piston I see it is actually a nickel plated steel!

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Lack of corrosion in bore plus corrosion high up on pistons is telling me is the main source of corrosion is actually outside of hydraulic seal which suggests regular dot 4 fluid replacement would not help reducing corrosion at all. Also having cleaned pistons  not suprisingly nickel is not as good as chrome corrosion wise but at least they may not stick.

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