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Road vehicles. Brake lining friction materials. Standard performance test procedure for commercial vehicles with air brakes Ingestion-build-137917 Who is BS 6401 –1 Scope This International Standard applies to commercial vehicles of the categories M2, M3, N2, N3, O3 and O4, as defined in UNECE R. E. 3, which are equipped with air brakes. This International Standard applies during product development, product prototypes, product specification or validation, and ongoing series production, as defined in ISO 15484. When used in conjunction with other applicable standards or test procedures, this International