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is it toast or this fixable?
Blown piston seals are a normal failure mode on all disc brakes, but Shimano don't do rebuild kits (Hope and SRAM do) so if the seal is destroyed, you're fucked.
As @coventry_eagle intimates, sometimes it's just dirt stopping the seal from sealing and you can rescue it, especially if you get to it quickly.
gbj_tester
The SLX brake on my polo bike is leaking from one of the pistons - is it toast or this fixable?