whats best way to remove caliper.. got the 2 big bolts off.. but it wont slide.. do i need to compress, and whats best way.. this is rear brake on 2005 f350 single rear tire

 

Mosttimes you can just pull hard on the caliper (towards yourself) and it'll compress the piston enough to slide the caliper off.. Or, you can use a small pinch bar/larger screwdriver and pry between the outer caliper (facing you where the outboard pad fits/mounts)and the rotor surface to push the piston back..

 

Make sure you compress that caliper some first, as I think the pads have a couple of pins inthem that will break the caliper pistons if you try to pull it off without compressing