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  • The SLX brake on my polo bike is leaking from one of the pistons - is it toast or this fixable?

  • Happened to my XT , cleaned, bled with new pads and no issues since.

  • 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.

  • If it's leaking from the piston I reckon it's fucked, new caliper and be very careful about cleaning the rotor.

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