CLASS 2 HITCH

I think it's a Torx bit that removes the two caliper bolts but since it's located on the back side of the caliper with a rubber boot around it I can't be sure. If so, what size Torx? If not, what do I use then?
Okay, shortly after I wrote the question, I remembered what I needed from the last time. It is an allen wrench -- I got one that uses a ratchet to drive it. But the guy that thought it was a t55 torx did give a good suggestion (although too late) about just loosening the bottom bolt and pivoting the caliper up. I will remember that for next time.... And, please, enough with the stupid answers on here like, "call a parts store and ask them" or "buy the repair manual" I KNOW I can do that, but I chose to aske the question HERE. If you don't know the answer, don't bother with telling me where else I can find the answer, I'll wait till someone with some knowlege responds here.