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.

[itsnotanova]

Yes the upright and caliper are aluminum but the bolt is steel. I believe it's a corrosion issue as I see it happen on cars that either spent most of their life in snowy conditions or very close to the ocean. The exhaust manifold bolts have a high rate of corrosion issues too..

[Strayconch]

I got my new bolts today, just waiting on the m12-1.5 tap to clean up the threads.

[Strayconch]

Tapped, flushed and torqued. Back on the road. After 17 year, there does show signs of the two different alloys fighting each other.