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@Aroogah
So QQ - I am about to fettle with disc brakes this weekend for the first time. I have a set of Shimano XTs on an MTB. The front brake has one of the pistons moving when squeezed, but not the other. I have used the advice on here to clean, lube and push the piston back into place. Same thing happens though. No wheel or pads in place.
Are they likely to just need centreing? Or bleeding as well?
#ihavenoideawhatiamdoingdog