I wouldn't tighten the already tight bolt.. unless you want to replace it. Because, what you are doing is stretching the bolt [usually beyond it'* torque rating], which makes it thinner [thus making it easier to remove]. This in terms could damage your bolts.. but if you are replacing them, then that is definitely a good idea.

Also, when you are spraying it.. spray it everywhere you think will get to those threads.. and don't go at it with a 5' breaker bar.. that'* waaay too much torque [unless you are very weak], which again could cause damage to the bolts and/or caliper.

Is the bolt a hex-head or a torx? Never removed my calipers before.. torx you may be alright.. but a regular hex head.. MAY be a little damaged and in need of replacing [be sure to inspect it for rounded edged and the like].


-justin

OK, got 'em done. The problem I had was that I couldn't open the garage door to run the hose for the impact wrench, so those nasty, sticky bolts weren't going anywhere.
Well, after several hours of finagling and damn near herniating myself, I got the garage door up about an inch and a half.(HEAVY garage door, and the assist-spring cables snapped when my brother hit it the other day.)
Anyway, with the help of the now-accessible impact wrench, the bolts came out in about 4 seconds each. I haven't had time to download the pics of them on the car yet and I'm bushed, so I'll get them up tomorrow.

PB blaster is a life saver but where did you pick those up at?