The brake pads have a tiny wear indicator tab on them. This tab is situated so
that it will contact the rotor at a right-angle when the pad gets below about
10%. If this is the source of your noise, it should sound like a high-pitched
squeal or chirping. Applying the brakes flexes the pad slightly, pulling the
wear indicator away from the rotor. Once the pads wear enough, applying the
brakes won't stop the noise. Sound familiar? If so, it's just time for new
btw, the wear indicator is a much softer metal than the rotor. It won't cause
any damage. Ignoring the symptoms can result in the metal backing on the pad
contacting the rotor. That will cause severe damage to the rotor.
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