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The brakes are XT and the new rotors drag slightly. Will the pistons reset with a few heavy stops or is there something else I should do...?
Did you push the pistons back when you fitted the new discs? Also you're meant to change pads (not saying that I ever do) when changing discs, as the previous pads will have a bit of a shape to them matched to the old disc
See if it's still the same after a few proper rides.
Push the pistons back, check the caliper is centred and that both pistons are moving freely.
Push the pistons back, [u]check the caliper is centred[/u]
+1 one, rotors differ. Don't expect it to be centred, just because your last one was
Thanks guys. Took the advice and the front is sorted the back needs a little tweaking but will be sorted by the time everything is burnt in.