| 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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| 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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| 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 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 |
| Click here to view the full document file |
| 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 |
| Click here to view the full document file |
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