I'm about to do a front brake rotor and pad replacement and am needing to know what size hex wrench to us to remove the caliper bolts. A 8mm feel loose and a 10mm is to large. I've never seen a 9mm and I don't want to risk stripping the bolt head. Is there a special tool? Never had this issue with my 01 XK8.
Thanks

 

No special tool mentioned in the workshop manual, but it doesn't specify the bolt size either.

 

I determined that the hex bit (socket) needs to be a 9mm. They are not usually included with hex bit sets. However Amazon has both 3/8" and 1/2" drive hex bits for use with impact tools. These are longer than the non impact version and give the necessary clearence. I found them to be just what was needed.