So, I go to start to change my brakes and rotors when I get stuck basically at the beginning. Does anybody know whether the bolt holding on the caliper uses a torx wrench or an allen key? and what size? It almost seems as tho its a torx and is caked with so much dirt and grime that it has the appearance of an allen key. Being i cant get my head back there, the best i could do is feel around and shove some clay in there to see what shape the impression was haha. If you have any ideas i'd appreciate it!

Should be an allen key... but just to be 100% sure, clean it and check with the clay[8D]

if its an allen key or hex..it should be 3/8

i dont know about that, but my 96 Grand AM haynes manual says mine has a torx fitting, and when i changed the breaks, it had a torx fitting. If i remember correctly torx is newer and used on newer cars, so yours should definitly have it.