[Recoil spring]

Don't they have mounting bolts? If so just unbolt them but don't let them hang there using the hoses to hold them up. When I was a mechanic on the older cars we had to do this to remove the rotors for bearing re-greasing, I often found a way to let the calipers lay on some part of the structure of the car while I pulled the rotors.

I see some of the car enthusiasts who do paint their calipers, looks nice.