Might want to try this...Drop the pads back in (no pins) and wedge a big screwdriver between the pad and the rotor and pry between, pressing the pistons back into the calipers. Do this on the inner and outer sides to see if you can tell a difference with how easily the pistons push in inner vs. outer. You need to know if those calipers are stuck. Do this with old pads and rotors before you put the new ones on.
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