You can't get the caliper bolts free? Soak them a couple times a day for a couple days running in PB Blast, tap on 'em firmly when you do, then when you're ready heat them super-smoking-hot, and use a
long breaker bar. I have an 18" bar, and for stubborn stuff I like to put about four feet of pipe on the end of that. Leverage is king - they
will break free, or they'll just break, either way you'll get the caliper off.