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I pulled apart a leaking Shimano M615 caliper today and found that the piston seals are leaking (not the little 3 mm o-ring). I've found possibly suitable piston seals on ebay from China. They aren't expensive at ~£4 a pair. But I expect they will take a few weeks to arrive.
Has anyone tried them and successfully fixed a leaking caliper?
I bought some eBay piston seals and changed those and the O ring. No leaks, no problem. Easy easy.
Worth noting this.
Let us know how it goes OP.
I ended up buying another deore 4 pot caliper but have still got the old one in the spares box.
<p style="text-align: left;">The leaks I've encountered have not originated from between the seal piston interface. They generally get corroded inside the seal groove & this provides a leak path for the fluid. Have you had the original seals out for a look?</p>