Brakes 2002 Caliper Rebuild

Gentlemen, recently changed rotors and pads on 2002 GT. Replaced fluid, but now have dragging piston on one side. I guess the 'o' ring got screwed up pushing the piston in. Never changed one on a Mustang, but I usually just pump the piston out and change the ring. Anything I should do or not do here.

Thanks in advance,

Lonestar
 
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