When your brake pads wear down completely, the metal backing of the pads can come into direct contact with the metal surface of the rotors. This metal-on-metal contact causes a vibration that can be felt in the steering wheel and/or brake pedal. This vibration usually occurs when you apply the brakes at high speeds or when you suddenly hit the brakes.

The vibration may also be accompanied by a scraping or grinding noise, which is caused by the metal backing of the pads rubbing against the rotor. If you experience this type of vibration, it's important to have your brakes inspected as soon as possible, as it can be a serious safety issue. In addition, the excessive heat buildup caused by the metal-on-metal contact can warp or damage the rotors, resulting in a more costly repair.
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