Working on replacing hubs.

My truck spent a couple of years on the coast and the two bolts that hold on the caliper bracket seem to be pretty well frozen on there. I have been soaking them with PB blaster for the past couple of days with no luck. The heads on the bolts have started to strip, so I don't want to put any more pressure on them.

questions:
1. How much heat should I put on them to try to coax them out?
2. Where do I apply heat? Head of bolt? Around the bolt on the caliper bracket?
3. Will tapping with a hammer loosen any of the treads?


any other suggestions?

 

If you can I would get an impact on it pronto. If you can get it to a good shop they can probably put some heat to it and smack it off with the impact.

Any other way may cost more headaches

Diz