FKS help needed

I have a pair of fks 180's with a 115 mm brake on my 90mm skis, my dad bought some fks 180's with a 95 mm brake and he needs to put those on a 110mm ski, so we plan to just swap brakes, so here comes the question, do you have to take the whole binding off to remove the brake or can you just undo some screws, I would prefer not to take off the whole binding because I would hate to mess something up and end up ruining my skis. k+ for any handy dandy helpers