Compress Brake Piston?

Hey folks so I heard my front brake pad wear indicator noise/squeal, and I am currently in the process of replacing the brake pads myself. However during the process I can't seem to compress the driver side brake piston with the C-Clamp, I have tried so hard it has begun to hurt my hands, I might use a large plier and try.
Do you think I may just need to replace my brake caliper/ get one from the junk yard?
 
Do you have the cap off of your brake res? should re-leave pressure in the system so you can compress it. If that doesn't help then crack the bleed screw on the caliper itself and try to compress it. If it still doesn't work you may be better off just replacing it.
 
Yea I Just replaced the whole caliper for $80 from CarQuest Store...Piston was completely seized and wasn't going back in, now I have to bleed my brakes, hate this process !
 
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