I mistook a proud piston for sticky. Not so. Levering errant piston (pads out) while pumping lever will cause the opposite piston to compensate (thanks James!) Once pistons are equidistant, then you can replace pads & perform a reset. Squeeze brake lever once & let go (wheel out/no disc), then push downward & through middle of pads with screwdriver firmly pushing both pistons back into their bore. Hopefully now, with wheel reinstalled, there should be an equal amount of daylight either side of rotor.
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