95 Integra LS: rotor was replaced and the brakepads are positioned for service.
caliper gap must be opened wide enough to receive the new rotor, that is sandwiched between the two new brakepads. The piston must be moved to open the caliper gap wide enough for two brakepads and the rotor. I expect that the piston must be fully retracted and flush with the caliper body.
C-clamp, powered by an 18" socket wrench attempts opening the caliper gap lever. A ridiculous amount of torque is applied to open the gap. I do not think that this amount of torque should be necessary: therein lies my concern that I am doing something wrong.
It is not clear to me if it is necessary to somehow open up the sealed brake fluid system so that the caliper piston will not close up the gap or how to do this if need be.
UDPATE: I now suspect that the Piston in center of photo must be rotated and not compressed by a C-clamp: