| 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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| PMP Task Force 4 status report |
| Reference Number: PMP-56.3-07 |
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Task Force 4 addresses brake system development towards dry brakes, specifically electromechanical brakes. Current methods to determine friction brake torque available for hydraulic systems are not all applicable for dry systems. Task Force 4 targets defining a pressure-based equivalent method for electromechanical brake systems and reviewing document validity for electromechanical braking systems. Work Package B completed text document review with proposed changes due end of May 2026. Work Package A discusses two alternative approaches for c-factor calculation: clamping force based and recuperated energy based, with verification tests planned by end of June 2026. |
| Meeting Sessions: PMP-56.3 (7 May) |
| Document date: 07 May 26 |
| Relevant to: UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system and GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles |
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| PMP Task Force 3b status report |
| Reference Number: PMP-56.3-04 |
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PMP Task Force 3b held kick-off on 07.05.2026 to address vehicles with legal limited speed, vehicles unable to follow cycle trace, and vehicles with capped speed by OEM decision. Proposals include adaptation of UN R179 cycle and procedure for vehicles with legal limited speed at 90 kph, with same duration for acceleration, cruise, and deceleration events, same acceleration and deceleration rates, and speed capped when needed. Introduction of such vehicles into brake corner emission families and vehicle types requires methodology to calculate adapted cycle and procedure, including c-factor measurement as alternative to fixed c-factor, and adaptation of Annex 5 procedure. |
| Submitted by: OICA |
| Meeting Sessions: PMP-56.3 (7 May) |
| Document date: 07 May 26 |
| Relevant to: UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system |
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| PMP TF 3a Consolidation & Update of UNR179 & GTR24 |
| Reference Number: PMP-56.3-02 |
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PMP TF 3a is consolidating and updating UN R179 and GTR 24 through weekly web-meetings organized by JRC with 30+ participants. Over 50 topics have been identified and categorized by priority. Key issues include aligning Type Approval and Conformity of Production testing procedures, harmonizing cooling air adjustment requirements, clarifying vehicle c-factor calculations, adding definitions for light-duty vehicles exceeding 3.5 tonnes, and addressing test wheel load per GRPE-94-15e. The task force is preparing track changes versions and supporting documentation for major changes. |
| Meeting Sessions: PMP-56.3 (7 May) |
| Document date: 07 May 26 |
| Relevant to: UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system and GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles |
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| GTR 24 and UN R179 consolidation: Table of changes |
| Reference Number: PMP-56.3-03 |
| Meeting Sessions: PMP-56.3 (7 May) |
| Document date: 07 May 26 |
| Relevant to: UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system and GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| UN R179: Proposal to amend GRPE/2026/25 |
| Reference Number: GRPE-94-35 |
| Meeting Sessions: 94th GRPE session (17-19 Mar) |
| Document date: 17 Mar 26 |
| Document status: Formal GR review |
| Relevant to: UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system and WP.29 Regulatory Project | Review of Regulations for Applicability to ADS Vehicles |
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| UN R179: Proposal to amend the original text |
| Reference Number: GRPE-94-14 |
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Proposal to clarify the selection of the wheel load among vehicles with identical brake assemblies for particle emissions testing. |
| Submitted by: OICA |
| Meeting Sessions: 94th GRPE session (17-19 Mar) |
| Document date: 13 Mar 26 |
| Relevant to: UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system |
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| UN R179: Wheel load used during brake corner emissions testing |
| Reference Number: GRPE-94-15 |
| Submitted by: OICA |
| Meeting Sessions: 94th GRPE session (17-19 Mar) |
| Document date: 13 Mar 26 |
| Relevant to: UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system |
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| UN R179: Document WP.29/2026/36 findings and proposed changes |
| Reference Number: PMP-56.1-11 |
| Submitted by: AVL |
| Meeting Sessions: PMP-56.1 (26 Feb) |
| Document date: 26 Feb 26 |
| Relevant to: UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system |
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| Comments for GTR 24 and UN R179 amendment |
| Reference Number: PMP-56.1-09 |
| Submitted by: LINK |
| Meeting Sessions: PMP-56.1 (26 Feb) |
| Document date: 26 Feb 26 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles and UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system |
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| 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 |
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| UN R179: Proposal for a Supplement 1 |
| Reference Number: GRPE/2026/25 |
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Proposal to enable the approval of vehicles equipped with an Automated Driving System under the new UN Regulation on brake particle emissions. |
| Meeting Sessions: 94th GRPE session (17-19 Mar) |
| Document date: 05 Jan 26 |
| Document status: Formal GR review |
| Relevant to: UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system |
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| Brake particle measurement: Proposal for a new UN Regulation | |
| Reference Number: WP.29/2026/36 | |
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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. |
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| Meeting Sessions: 198th WP.29 session (9-13 Mar) | |
| Document date: 29 Dec 25 | |
| Document status: Adopted by WP.29 | |
| Relevant to: UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system | |
| Adoption Vote | |
| This proposal (WP.29/2026/36), as amended in para. 70, was adopted by the World Forum. Thirty-five Contracting Parties out of the 0 applying UN R179 were present for the vote by AC.1. Thirty-four voted in favor with zero against and one abstaining. | |
| View full document file for more information | |
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| Brake particle measurement: Draft Supplement to enable application of the draft new UN Regulation to ADS vehicles |
| Reference Number: GRPE-TF-AVRS-31-11/Rev.1 |
| Meeting Sessions: 31st GRPE-TF-AVRS session (10 Dec 2025) |
| Document date: 19 Dec 25 |
| Relevant to: UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system |
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| Brake emissions: Proposal to amend the draft UN Regulation for application to ADS vehicles |
| Reference Number: GRPE-TF-AVRS-30-11/Rev.1 |
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Proposed amendments updated with in-session revisions. |
| Meeting Sessions: 30th GRPE-TF-AVRS session (27 Nov 2025) |
| Document date: 27 Nov 25 |
| Relevant to: UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system and WP.29 Regulatory Project | Review of Regulations for Applicability to ADS Vehicles |
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| 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 |
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| UN R Brake particle emissions of LDVs |
| Reference Number: GRPE-93-51/Rev.1 |
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Conversion of UN GTR24 into a UN R |
| Submitted by: OICA |
| Meeting Sessions: 93rd GRPE session (14-17 Oct 2025) |
| Document date: 17 Oct 25 |
| Relevant to: UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system |
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| UN Regulation No. [XXX] on the Laboratory Measurement of Brake Emissions for Light-Duty Vehicles : Proposal for amendments |
| Reference Number: GRPE-93-48/Rev.1 |
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Proposal to amend ECE/TRANS/WP.29/GRPE/2025/18 |
| Submitted by: EC, OICA, and UK |
| Meeting Sessions: 93rd GRPE session (14-17 Oct 2025) |
| Document date: 16 Oct 25 |
| Relevant to: UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system |
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| 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 |
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| 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 |
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| GTR 24 and UNR on brake emissions: Input for PMP informal group discussions |
| Reference Number: PMP-56-04 |
| Submitted by: OICA |
| 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 and UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system |
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| 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 |
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| UN R: Laboratory Measurement of non-original and identical replacement brake parts with regards to particle emissions |
| Reference Number: GRPE-93-13 |
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This document aims at transposing UN GTR 24 into a new UN Regulation on uniform provisions concerning the approval of non-original and identical replacement brake parts with regards to particle emissions. |
| Submitted by: CLEPA |
| Meeting Sessions: 93rd GRPE session (14-17 Oct 2025) |
| Document date: 10 Oct 25 |
| Document status: Superseded |
| Relevant to: UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system |
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| 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 |
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| Inputs for PMP meeting on 26th of September 2025 |
| Reference Number: PMP-55.2-08 |
| Submitted by: OICA |
| Meeting Sessions: PMP-55.2 (26 Sep 2025) |
| Document date: 29 Sep 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles and UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system |
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| 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 |
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