Disc brake pads normally ride against the rotor. They will squeel slightly, then quit when you put on the brakes. Could be dirt. There is a blue anti-squeel liquid compound you can put on the back of the pads that probably won't help at all. If the caliper is sticking, could be "iced" up, or stuck with dried brake fluid. Might also try lubing the slide collar and o-rings on the bolts and caliper ears. There is a red disc brake lube for this also. If all else fails, take the pads off, scrub them, clean the rotors with brake cleaner and try it again. Real PIA sometimes. tom