Ive been trying this morning to get the inboard piston to move out of the caliper without success. This is using a bicycle pump, with the other piston in place and
clamped down so as not to come out. Ive put all the force I can into the bicycle pump, (which ejected the other piston well) and it doesn't budge. Ive fully pushed it in with a vice but now cant get it out.

My only Idea is to reconnect the caliper to the brake line and bleed it and try using the brakes to push out the piston. I dont know how else I can get enough force to eject it.

Any Thoughts?

Update: I managed to get it to move out now that I hooked it back up and bled the line. Now I was thinking of pushing on the brakes till it popped out. my concern now is how to gte it back in if it was so difficult to come out.

Also I noticed the repair jit that I bougt for bndiz=x callipers have a heat sheild type ring which matches roughly th size and shape of the metal plate already on the piston, however there is no way for it to sit on there snuggly or at all it seems as there are some little parts bent a certain way that the original one doesnt have. Are you supposed to be able to remove the plate thats attached to the piston?