Hi,
I hope I am posting in the correct place. I went to autozone to get the correct allen wrench to change the front brakes on my 95 chevy blazer and found the 3/8 allen wrench they gave me fit the lower caliper but is loose in the top one. when I get my head around to try and look at it, the caliper head looks like it may have lines in it like torx. would this be possible? If so what size am I looking at?
Thanks in advance.

 

Almost sounds like someone used the wrong tool to replace them, I would just get new bolts from the parts store, get the ones that you have in there now out. The bolts are super cheap.