B NAO friction material. In a broad sense, it refers to non-asbestos - non-steel fiber type friction materials, but the disc type sheet also contains a small amount of steel fiber. The base material in NAO friction materials is in most cases a mixture of two or more fibers (to inorganic fibers, with a small amount of organic fibers). Therefore, NAO friction material is non-asbestos mixed fiber friction material. Usually, brake pads are short-cut fiber type friction blocks, and clutch pads are continuous fiber type friction blocks.
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