The pressure applied to the brake pedal is transmitted to the wheel cylinders through the brake fluid.
The wheel cylinder pushes the brake pad against the disc rotating attached to the whelll and stops the vehicle.
Since every time the brake pedal is depressed, the pad is pressed against the disc rotor which is rotating simultaneously with the tire to stop the vehicle, the frictional surface of the pad gradually wears off and affecting stopping efficiency. In worse case the basic of the brake pad will scorch the rotor resulting in expensive replacement.
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When the brake pad becomes thin, the metal back plate comes in contact with the disc rotor.
The disk rotor will be damaged by the worn brake pad metal back plate. It will result in dangerous situation and higher cost of parts replace.
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