I have a repetitive problem with the inside pad dragging on a set of 06' Juicy Carbon brakes (front). The inside pad doesn't want to retract as much as the outside pad. It has been aligned many times and bled but will only take a ride or two before the inside pad begins to drag again. The fix is to realign. But because the pad isn't retracting completely (At least that's how it appears) the clearance immediately after alignment is very close. No more than .020in clearance per side. The rotor is true to within .005in.
I have also run the pads in and out to their limits (with the wheel off), blown off the piston with compressed air and then lightly lubed the pistons. This didn't seem to make any difference.
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Thread: Juicy Carbon Brake Drag