Mustang 98 Rear Pad Replacement

Have a 98 Mustang GT V8 and attempted to replace the rear disk break pads. Having trouble compressing the caliper piston to make way for the new pads.
The piston compressed less than a 1/4 inch before stropping. Any thoughts??
Thanks,
Joe
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the most imprtant part of a car if u dont know that they screw inn u should not fuck with them ya foctard
whose your pappa
hurc ast
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