When composition brake shoes are used, excessively severe wear is sometimes observed on wheel treads. It is often accompanied by "metallic inclusion" which is formed on the friction surface of brake shoes. Therefore, we investigated the "metallic inclusion" generating mechanism. As a result, we have obtained the following results by experiments. In almost all cases, metallic inclusion is formed when the following three conditions exist simultaneously; mixing of ceramic grains, wet condition and low pressing force of brake shoe. Moreover, the metallic inclusion tends to wear wheel treads extremely during its growing process as a phenomenon of adhesive wear.

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