Stuck bolt

[blue62]

Originally Posted by Quadcammer

The bolt threads into the upright or knuckle as some people call it. The holes in the caliper are non-threaded through holes

Thanks for the clarification.
Am I correct in assuming the upright is aluminum????
My thought is that at some point in time that bolt was over tightened.
That tends to draw the threads out of the aluminum. Thus the aluminum material in the bolt threads. Also I like to use anti-seaze on anything threaded into aluminum.