You could have a noise between the brake pad and rotor, this happens many times if the brakes were replaced and the rotors were not resurfaced. If this is the case you may need to redo the complete job correctly to fix it. The other common reason is that the brakes are worn out, most brake pads have a sensor built into them to make noise when the brake are worn out. Many cars today have electronic sensor that will let you know on the dash when the brakes are thin.
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