Usually because of wear, a disk brake system typically has a squealer that with contact with the rotor will make a squeaking sound telling you its time to change the brakes..some have no squealer and the sound is coming form the rivets on the pads making contact with the rotor..ie past time to change..If the brake pads have been changed or are in fine shape and there is a squeak it is because there is no anti squeal compound on the back side of the pads.
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