Nessism wrote: The pistons were seized tight on my 750 calipers as well but eventually I managed to free them up. Unfortunately, two of the three caliper pistons were pitted and had to be replaced, at a fairly high price. Kawasaki isn't doing us any favors in that regard. I just checked the availability and it seems the pistons are no longer available from Kawasaki but there are a few kicking around on ebay. Fortunately, the piston seals and dust boots are still available. I strongly advise purchasing OEM parts, not aftermarket like K&L. I've had bad experiences with K&L brake system parts on three different occasions so use at your own risk. You can clean the calipers in solvent just as long as you keep any rubber parts you plan to reuse out of the sauce.
I suspect the coating is more about resistance to pitting and low friction against the seals than it is about wear.
I wonder if there is a newer brake system that uses pistons of the same dimensions? The manufacturers often (always?) buy brake components from outside vendors. Sometimes competing models will use the same calipers with some irrelevant difference. For instance, the ZRX has a pair of six piston calipers up front. A full rebuild using Kawasaki parts is shockingly expensive. Suzuki used the exact same calipers on the Hyabusa, but with anodized aluminum pistons instead of Kawasaki's plated steel ones. The aluminum ones are a fraction of the weight and cost of the steel ones. Also, Suzuki sells the seals for a fraction of what Kawasaki charges. Exact same seals.
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