Rear brake drags after tire replacement

Sucked the air out through the rear caliper, added fluid to the rear master cylinder to keep it from sucking air. Have a firm brake peddle (and front brake). The read pistons are still not retracting, causing a serious drag on the disc. I also cleaned the caliper retaining pin.
Wow, those rear pads are seriously worn down... leaving the pistons exposed...
 
Cleaned the pad retaining pin and the caliper pins then put a light coat of silicone grease on them and reassembled. All is good now! Thank you to all who commented.
 
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