GAR | WP.29/2026/36

WP.29/2026/36

Brake particle measurement: Proposal for a new UN Regulation

Source(s)

Date

29 Dec 2025

Status

Adopted

Subject

UN R179 Brake emissions

Impact

Original text

Meeting(s)

WP.29 | Session 198 | 9-13 Mar

Agenda item 4.13.1. Proposal for a new UN Regulation No. [179] on the Laboratory Measurement of Brake Emissions for Light-Duty Vehicles

Proposal to establish requirements for the type approval of vehicles with regard to the particle emissions of their braking systems, including uniform methods for their measurement. Japan abstained from the vote to adopt.

Downloads

UNECE server

Related documents

Excerpts from session reports

WP.29 | Session 198 | 9-13 Mar

70. WP.29 considered a draft new UN Regulation under agenda item 4.13.1. (ECE/TRANS/WP.29/2026/36) and recommended its submission to AC.1 for voting, subject to the following amendment:
Annex 1, Appendix 1,amend to read:
…

Brake enclosure design
Reynolds number at the entrance of the enclosure [—]	..
The airspeed at each position of the plane C used for the speed uniformity verification does not vary by more than ±35 per cent of the arithmetic mean of all measurements for the setup’s minimum operational airflow	..
The airspeed at each position of the plane C used for the speed uniformity verification does not vary by more than ±35 per cent of the arithmetic mean of all measurements for the setup’s maximum operational airflow	..

…

With 35 of the 0 Contracting Parties applying UN R179 present and voting, AC.1 adopted document WP.29/2026/36, as amended in para. 70 per the session report, by a vote of 34 in favor, 0 opposed, with 1 abstaining.