If you have a friend who has impacts try that. I too had a stuck caliper bolt and it wouldn't come off with a breaker bar and a huge pipe. Eventually I just took it to my buddy's shop and it came off within seconds after using an impact.
When you do get it off be sure to use a ton of anti seize on the caliper bolt to insure it slides good. I had one snap off inside the caliper bracket and was PITA to get off. I had to drill a hole inside the broken caliper bolt, tap it, thread a bolt in it, and use a acetylene torch and pry it out.
That's what happens when those caliper bolt pins seize up. Anti-seize will keep that from happening.
Hope this helps
