Thinking about this some more, since the pins are attached to the caliper and not the bracket. With it removed from the bike, I suppose the whole caliper could slide out of the carrier taking the pads with it since the pins just ride in the carrier.Maybe you could get the pads out if you removed the caliper bracket from the bike (removed rear wheel - or at least the axle and spacer). Doesn't seem like that would be possible, but I have not tried it. If you took the caliper bracket off the bike - then yes you could easily compress the piston, even with the pads still sitting in the bracket/caliper. Couldn't grease the caliper pins completely with them still installed, which would be an issue.