Still on the 1991 560SEL, the bolt attaching the brake rotor to the hub seems to be on tight. I used PB Blaster to loosen it up. I'm afraid if I torque on it too hard it may strip. On another website, a guy uses a brass hammer to strike on the edge of the rotors to help break the rotor loose. However, he first loosens the bolt holding the rotor to the hub which is my problem. Can I use a heat gun to help loosen up the attachment bolt?

I really don't want to strip this bolt out.......