Proposal to establish a UN Regulation for laboratory measurement of brake particle emissions from vehicles of categories M2, M3, N2 and N3 using friction braking systems. The regulation specifies test procedures including brake bedding and brake emissions measurement using the Worldwide Harmonized Heavy Duty Vehicles Brake Cycle, defines brake emissions groups and representative configurations for testing, establishes emission limits by vehicle category and powertrain technology (though limits marked as ‘not yet specified’ in the provided draft), requires conformity of production testing with statistical verification procedures, and sets technical requirements for brake dynamometer systems, brake enclosure design, sampling tunnels, cooling air conditioning, particulate matter and particle number measurement systems, and data acquisition.
Informal Working Group: A group of experts authorized to develop proposals for consideration by WP.29 without being bound by formal UN rules of procedure.