Get yourself some brake cleaner, take the calipers off (it's only 4 bolts). Then squeeze your brake lever a couple times with the calipers off. What that does is exposes more of the caliper pistons, then take your brake cleaner and spray the shit out of both calipers (spray the pistons). Then gently use a flat head screwdriver to push the pads back towards the outside of the calipers (you have to get them back on your rotors right ??). Before you put the calipers back on, spray the surface of the pads. Don't be scared to use your brake cleaner..... Then put the calipers back on. I think the recommended torque setting for the caliper bolts is 37 ft/lbs (someone correct me if I'm wrong).
MAKE SURE YOU GET YOUR PADS BACK IN PLACE BEFORE YOU RIDE !!!!!!!!!!!!!!!!! TO DO THIS JUST PULL ON YOUR BRAKE LEVER ABOUT TEN TIMES
DO NOT !!!!!!! Just pull your bike out of your garage and take off. MAKE SURE your pads are seated properly before you go for a ride.
I don't know if that will take care of the "squeaking" or not, but it'll eliminate dirty pads as a suspect...
:cheers
AL