Proposal to establish a new UN Regulation on laboratory measurement of brake emissions for heavy-duty vehicles of categories M₂, M₃, N₂ and N₃ using friction braking. The regulation defines test procedures, brake emissions groups, compliance requirements with emission limits for PM10 and SPN10, type approval processes, conformity of production requirements with statistical sampling procedures, and technical specifications for test systems including brake dynamometers, brake enclosures, sampling tunnels, and particle measurement instrumentation.