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The gray-black dust that often covers a vehicle's wheels is called brake dust. The majority of modern brake pads are semi-metallic. A bundle of steel fibers is compressed and then fused with other additives to build a pad. Steel fiber can actually make up 30% of the brake pad so when it is pressed against the brake rotor it scratches the rotor and creates brake dust.

July 10, 2018

 

 

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