You may be hearing a normal noise coming from your metallic brake pads: a piece of metal could be exposed in the pad, causing this noise until it wears away. Or you may have worn brake pads and the pad sensor is hitting the rotor, telling you that your pads are worn and need to replaced. The only way to know for sure is to have your brakes inspected for the source of the noise, to see what may be needed to fix it.
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