Program to develop a heavy-duty vehicle version of GTR 24 on measurement of brake particle emissions.
| Particle Measurement Programme: Minutes of the 56th (May 2026) session |
| Reference Number: PMP-56.3-10 |
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The 56th PMP session convened online on 7 May 2026 with approximately 70 participants. Meeting minutes from 13 March 2026 were accepted. PMP agreed on a joint neutral template for all task forces. TF3a discussed cooling air adjustment, temperature criteria, and vehicle emission factors, with proposals requested by end of May 2026. TF3b will discuss family building and speed-limited vehicles. TF3c presented brake replacement parts activities. TF4 prepared work package B on electromechanical brakes and requested feedback by end of May 2026. TF5 reported progress on GTR on HD brake particle emissions with test campaigns planned. The next meeting is expected end of June or beginning of July 2026. |
| Meeting Sessions: PMP-56.3 (7 May) |
| Document date: 11 May 26 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles, WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement, UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system, and WP.29 Regulatory Project | Approval of Non-Original and Identical Brake Parts with regard to the Particulate Emissions |
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| Heady-duty vehicle brake emissions discussion points |
| Reference Number: PMP-56.3-08 |
| Meeting Sessions: PMP-56.3 (7 May) |
| Document date: 07 May 26 |
| Relevant to: WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement |
| Click here to view the full document file |
| PMP Task Force 5 Status Report |
| Reference Number: PMP-56.3-02 |
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Task Force 5 is progressing on GTR development with tests on endurance braking ending 07/2026 and potential GTR adoption at GRPE 95th session 10/2026. Draft revisions to Sections 7 and 8 are agreed and incorporated, addressing caliper orientation, fixed airflow, and additional loading factor. Nominal test parameters for brake groups are under revision, with tables from R90 defining disc and drum brake specifications. A small Round Robin Exercise with five volunteers is underway to assess enclosure and duct diameter impacts, with results due first week of June. Auxiliary Braking Systems testing requires significant immediate effort. |
| Meeting Sessions: PMP-56.3 (7 May) |
| Document date: 07 May 26 |
| Relevant to: WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement |
| Click here to view the full document file |
| Particle Measurement Programme: Agenda for the 56th (May 2026) session |
| Reference Number: PMP-56.3-01 |
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The PMP webex meeting scheduled for 7 May 2026, 12:00-14:30 CET will review meeting minutes from 13.03.2026, provide an overview of amendments to Brakes GTR 24 and UN R179 covering layout and testing topics, vehicle limited speed, brake replacement parts, and electromechanical brakes, discuss GTR HD brakes, and address any other business. |
| Meeting Sessions: PMP-56.3 (7 May) |
| Document date: 07 May 26 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles, WP.29 Regulatory Project | Electromechanical Braking Systems, WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement, UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system, and WP.29 Regulatory Project | Approval of Non-Original and Identical Brake Parts with regard to the Particulate Emissions |
| Click here to view the full document file |
| Particle Measurement Programme: Minutes of the 13 March 2026 session |
| Reference Number: PMP-56.2-02 |
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The PMP session discussed revisions to the group’s terms of reference to address overlapping technical issues with GTR 24, UN R179, and replacement parts regulations. Three task forces were proposed: TF3a on layout and testing, TF3b on speed-limited vehicles, and TF4 on electromechanical brakes. Topics included non-original brake parts regulations, UN R179 amendments for new vehicle categories, and GTR heavy-duty brake particle emissions standards. The next meeting was scheduled for end of April 2026. |
| Meeting Sessions: PMP-56.2 (13 Mar) |
| Document date: 27 Mar 26 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles, WP.29 Regulatory Project | Electromechanical Braking Systems, WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement, UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system, and WP.29 Regulatory Project | Approval of Non-Original and Identical Brake Parts with regard to the Particulate Emissions |
| Click here to view the full document file |
| Particle Measurement Programme: Minutes of the 56th (February 2026) session |
| Reference Number: PMP-56.1-13 |
| Meeting Sessions: PMP-56.1 (26 Feb) |
| Document date: 27 Mar 26 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles, WP.29 Regulatory Project | Electromechanical Braking Systems, WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement, UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system, and WP.29 Regulatory Project | Approval of Non-Original and Identical Brake Parts with regard to the Particulate Emissions |
| Click here to view the full document file |
| PMP informal group status report to GRPE |
| Reference Number: GRPE-94-26 |
| Meeting Sessions: 94th GRPE session (17-19 Mar) |
| Document date: 18 Mar 26 |
| Relevant to: WP.29 Discussion Topic | Particle Measurement Programme, GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles, WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement, UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system, and WP.29 Regulatory Project | Approval of Non-Original and Identical Brake Parts with regard to the Particulate Emissions |
| Click here to view the full document file |
| Brake emissions: Proposal for a new UN GTR for heavy-duty vehicles |
| Reference Number: GRPE-94-27 |
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Proposal to establish a UN Global Technical Regulation for measuring brake particulate matter and particle number emissions from heavy-duty vehicles. The regulation defines laboratory test procedures using a brake dynamometer and the Worldwide Harmonized Heavy-Duty Vehicles Brake Cycle (WHBC), encompassing 20,353 seconds with 246 brake events across three driving segments. Tests require brake bedding with six WHBC repetitions, followed by emissions measurement. Laboratories must measure PM10 and PM2.5 mass gravimetrically and total and solid particle numbers (TPN10, SPN10) using particle counters. Technical specifications cover brake enclosure design, sampling tunnel configuration, climatic control, instrumentation calibration, and data reporting requirements to ensure reproducible and comparable brake emissions testing across regions. |
| Meeting Sessions: 94th GRPE session (17-19 Mar) |
| Document date: 16 Mar 26 |
| Document status: Informal GR review |
| Relevant to: WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement |
| Click here to view the full document file |
| Heavy-duty vehicle brake emissions: Working draft for a new UN GTR |
| Reference Number: PMP-56.2-01 |
| Meeting Sessions: PMP-56.2 (13 Mar) |
| Document date: 10 Mar 26 |
| Relevant to: WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement |
| Click here to view the full document file |
| Heavy vehicle brake emissions: Overview of informal HD GTR |
| Reference Number: PMP-56.1-10 |
| Submitted by: EC |
| Meeting Sessions: PMP-56.1 (26 Feb) |
| Document date: 26 Feb 26 |
| Relevant to: WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement |
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| HDV Brake Enclosure |
| Reference Number: PMP-56.1-06 |
| Submitted by: JARI and JASIC |
| Meeting Sessions: PMP-56.1 (26 Feb) |
| Document date: 26 Feb 26 |
| Relevant to: UN Regulation No. 90 | Replacement Brake Linings, Discs, and Drums, WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement, and WP.29 Regulatory Project | Approval of Non-Original and Identical Brake Parts with regard to the Particulate Emissions |
| Click here to view the full document file |
| PMP informal group: Agenda for the 26 February 2026 web conference |
| Reference Number: PMP-56.1-01 |
| Meeting Sessions: PMP-56.1 (26 Feb) |
| Document date: 24 Feb 26 |
| Relevant to: WP.29 Discussion Topic | Particle Measurement Programme, GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles, WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement, and UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system |
| Click here to view the full document file |
| Particle Measurement Programme: Minutes of the 56th (October 2025) session |
| Reference Number: PMP-56-08 |
| Meeting Sessions: 56th PMP session (14 Oct 2025) |
| Document date: 27 Oct 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles, WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement, UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system, and WP.29 Regulatory Project | Approval of Non-Original and Identical Brake Parts with regard to the Particulate Emissions |
| Click here to view the full document file |
| Heavy vehicle brake emissions: TF5 Cycle Candidate Revision |
| Reference Number: PMP-56-03 |
| Submitted by: LINK |
| Meeting Sessions: 56th PMP session (14 Oct 2025) |
| Document date: 15 Oct 25 |
| Relevant to: WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement |
| Click here to view the full document file |
| Study on non-exhaust emissions in road transport |
| Reference Number: PMP-56-05 |
| Submitted by: EMISIA |
| Meeting Sessions: 56th PMP session (14 Oct 2025) |
| Document date: 15 Oct 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles, WP.29 Regulatory Project | Tyre abrasion test method development, WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement, UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system, and WP.29 Regulatory Project | Approval of Non-Original and Identical Brake Parts with regard to the Particulate Emissions |
| Click here to view the full document file |
| GTR 24: Inter-laboratory Study #3: Summary |
| Reference Number: PMP-56-06 |
| Submitted by: EC |
| Meeting Sessions: 56th PMP session (14 Oct 2025) |
| Document date: 15 Oct 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles, WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement, UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system, and WP.29 Regulatory Project | Approval of Non-Original and Identical Brake Parts with regard to the Particulate Emissions |
| Click here to view the full document file |
| Heavy-duty Brake Emissions Test Layout (PMP SG1) |
| Reference Number: PMP-56-07 |
| Submitted by: EC |
| Meeting Sessions: 56th PMP session (14 Oct 2025) |
| Document date: 15 Oct 25 |
| Relevant to: WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement |
| Click here to view the full document file |
| Particle Measurement Programme: Agenda for the 56th (October 2025) session |
| Reference Number: PMP-56-01 |
| Meeting Sessions: 56th PMP session (14 Oct 2025) |
| Document date: 13 Oct 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles, WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement, UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system, and WP.29 Regulatory Project | Approval of Non-Original and Identical Brake Parts with regard to the Particulate Emissions |
| Click here to view the full document file |
| Particle Measurement Programme: Minutes of the 55th (September 2025) session |
| Reference Number: PMP-55.2-09 |
| Meeting Sessions: PMP-55.2 (26 Sep 2025) |
| Document date: 30 Sep 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles, WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement, UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system, and WP.29 Regulatory Project | Approval of Non-Original and Identical Brake Parts with regard to the Particulate Emissions |
| Click here to view the full document file |
| PMP: Overview of work on GTR 24 and heavy-duty vehicle brake emissions |
| Reference Number: PMP-55.2-04 |
| Submitted by: EC |
| Meeting Sessions: PMP-55.2 (26 Sep 2025) |
| Document date: 26 Sep 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles and WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement |
| Click here to view the full document file |
| PMP task force on heavy-duty vehicle brake emissions test procedures: status report |
| Reference Number: PMP-55.2-02 |
| Submitted by: EC |
| Meeting Sessions: PMP-55.2 (26 Sep 2025) |
| Document date: 26 Sep 25 |
| Relevant to: WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement |
| Click here to view the full document file |
| Particle Measurement Programme: Agenda for the 55th (September 2025) session |
| Reference Number: PMP-55.2-01 |
| Meeting Sessions: PMP-55.2 (26 Sep 2025) |
| Document date: 26 Sep 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles and WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement |
| Click here to view the full document file |
| Particle Measurement Programme: Minutes of the 55th (July 2025) session |
| Reference Number: PMP-55.1-13 |
| Meeting Sessions: PMP-55.1 (10 Jul 2025) |
| Document date: 15 Jul 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles, WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement, UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system, and WP.29 Regulatory Project | Approval of Non-Original and Identical Brake Parts with regard to the Particulate Emissions |
| Click here to view the full document file |
| PMP TF5-SG2 updates on GTR HD brakes: Cycles |
| Reference Number: PMP-55.1-12 |
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TF5-SG2 update on GTR HD brakes test cycle development. Phases include analysis of measured brake cycles from real world data, adjustment of VECTO driver model to meet real world distributions, integration of endurance brake model, and shortening VECTO mission profiles to test cycle candidate. SG2 decided to use VECTO cycles as basis, resulting speed cycle for optimisation, and cycle without road gradients. Next steps include elaborating method to calculate torque and rpm from speed cycle, further shortening cycle to approximately 4 hours, and testing cycle to elaborate quality criterion for reproducibility. Volume flow settings on HD brake dynos require elaboration in SG1. |
| Submitted by: TU Graz |
| Meeting Sessions: PMP-55.1 (10 Jul 2025) |
| Document date: 10 Jul 26 |
| Relevant to: WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement |
| Click here to view the full document file |
| PMP Task Force 5 Subgroup 1 Proposal for HD Brake Emissions Test System |
| Reference Number: PMP-55.1-09 |
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Proposal to establish sampling plane diameter of 300 mm or 12" with wall thickness of up to 1.5 mm, specify sampling tunnel straight section length between 8D and 10D, require single sampling plane layout with two PN probes on top and two PM probes on bottom, allow 4-probe sampling plane with flow splitter for PN connections only, prohibit flow splitter use for PM connection, permit sampling tunnel attachment directly to enclosure outlet or to 90-degree bend after enclosure, and standardize disc brake adapter and fixture and reduce drum brake S-cam length. |
| Submitted by: EC |
| Meeting Sessions: PMP-55.1 (10 Jul 2025) |
| Document date: 10 Jul 26 |
| Relevant to: WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement |
| Click here to view the full document file |
| Particle Measurement Programme: Agenda for the 55th (July 2025) session |
| Reference Number: PMP-55.1-01 |
| Meeting Sessions: PMP-55.1 (10 Jul 2025) |
| Document date: 09 Jul 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles and WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement |
| Click here to view the full document file |