Im rebuilding a set of LS1 calipers and I cant get the F@#!in pistons back in. Only 1 went back in easy. I can get the dust boots seated they start to push in then it just stops. I didnt have this problem with the rears. Any tips would be appreciated.

 

Finally got these POS together.. Never had such a problem rebuilding calipers before..

 

I usually take a piece of wood to put over the piston, then use the handle end of a hammer to tap on the wood to get them started.