When's the last time you washed your bike? My bike starts to do this when it gets dirty because a piece of dirt will get between the pad and the rotor which will cause it to squeal. Try hosing off the rotors and the pads. It also wouldn't hurt to pull the brake pads and rough them up with some sand paper. Then clean both the rotors and the brake pads with brake cleaner. Hopefully this will clear up the problem.
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