The ability of the Volkswagen disc brake pads to turn to dust is why they are made from a specific material composition. The gradual process of turning to dust occurs over thousands and thousands of miles when the disc brake pads are pressed against the rotors in the braking system on your Volkswagen. The materials the disc brake pads are made from include organics, ceramics, and some fine metallic particles. They used to be asbestos, which is hazardous when in a dust form. As time progresses the Volkswagen disc brake pads will wear out from being used in the creation of friction. This is their purpose in the braking system so the other components in it will remain intact. The only problem a Volkswagen owner might have with their disc brake pads is if they are totally worn out from being used up. When this occurs and all of the padding material that was on the pads is gone, the metal backing plate it was mounted to will comes in contact with the rotors on the braking system. This causes severe damage to occur to the rotors on the vehicle the formation of grooves being cut into the rotors. This can be heard by an extremely loud grinding noise coming from the wheel assemblies when pressure is being applied to the brake system. Before the new disc brake pads are placed on the Volkswagen, the brake rotors will have to be resurfaced so they will once again be flat. If this resurfacing is not done, then the new pads will prematurely wear causing them to be in need of replacing in a short period of time from being placed on the vehicle. This will eventually cost the owner of the vehicle more than resurfacing the rotors.