I'm getting an tune up done this week to winterize my car, will be garaged for 3 months. so far i changed the plugs, motor oil, tranny oil, brake fluid, and put in antifreeze, but now i want to also change the pads and rotors, been squeaky for some time now, but the damn lower caliper bolt wont come off, what can i do to get it to loosen up, already used a load of WD40 but nothing.