I am a owner of a 1992 dodge ram 50 4x4 I am trying to replace the brake rotors and calipers when I attempted to take the caliper off I removed the lower bolt and took the dust cover off the top bolt but can not figure out how to get it out it sets back in the caliper and online says it's a 12mm socket but even a thin wall 1/4in drive socket wont fit into the hole to take the bolt out any ideals or what I'm doing wrong