Proposal to amend Annex 2 – Appendix 1 to add para. 1.4.1. specifying user-selectable mode(s) resulting in the lowest recuperation and relevant pre-test procedures for vehicles with a vehicle specific c-factor according to Annex 5, and to delete items not brake emission related including brake circuit configuration, secondary braking system declaration, brake valve specifications, master cylinder type and size, and booster type and size.

Proposal to establish uniform provisions for approval of non-original replacement and identical brake pads, drum brake linings, brake discs, and brake drums for vehicles of category M₁, N₁, and N₂ between 3.5 and 5 tonnes maximum mass. The regulation applies brake emission testing procedures and particle emission limits by vehicle category and powertrain technology, with PM10 limits ranging from 3 mg/km for PEV vehicles of categories M₁ and N₁ to 11 mg/km for N₁ Class III and N₂ vehicles. Brake parts must be assigned to families based on characteristics including calliper type, axle location, friction material formulation, disc or drum material, brake disc surface form, pad surface area, and drum diameter. Approval requires testing of a family parent brake assembly and includes conformity of production requirements with annual sampling and statistical verification procedures.

Report on the third inter-laboratory study evaluating the repeatability and reproducibility of particulate emission factors using GTR 24 (1st amendment) across 14 laboratories worldwide. The study assessed laboratory proficiency in brake particulate matter and particle number emissions measurements for light-duty vehicles, testing two low-metallic brakes and one low-emitting NAO brake using the WLTP-Brake cycle. Inter-lab coefficient of variation for PM₁₀ was 10-15% for low-metallic brakes (4.5-8.5 mg/km emission levels) and 30% for the NAO brake (1.5 mg/km). Intra-lab repeatability for PM₁₀ was less than 5% for low-metallic brakes but higher for the NAO brake. A success rate of 94.8% was achieved after applying quality checks, confirming GTR 24 suitability for regulatory testing. The report provides recommendations for GTR 24 amendments including friction work calculation methodology, torque quality metrics, sampling probe setup standardization, and residual torque limits.

Overview of documents and working party activities for the 95th session of the Working Party on Pollution and Energy (GRPE). Documents address improvements to UN R179 (Laboratory Measurement of Brake Emissions for Light Duty Vehicles) including handling of vehicles with limited speed, brake replacement parts regulation, and GTR 24 (Measurement procedures for Brake corner emission factors). Related documents also cover a new regulation for heavy-duty brake emissions and a new global technical regulation for heavy-duty brakes. Working documents ECE/TRANS/WP.29/GRPE/2026/29, ECE/TRANS/WP.29/GRPE/2026/30, ECE/TRANS/WP.29/GRPE/2026/31, ECE/TRANS/WP.29/GRPE/2026/32, and ECE/TRANS/WP.29/GRPE/2026/53 are submitted.

Proposal to amend UN Regulation No. 179 to include testing of vehicles with limited speed. The document specifies amendments to the laboratory measurement of brake emissions for light-duty vehicles, including provisions for vehicles with a maximum speed lower than the maximum speed of the Base cycle. These vehicles may be part of the same brake corner emissions family as vehicles suitable for the Base cycle, with their emission factor calculated based on the parent family’s reference PM and PN emissions according to equations 7.1, 7.2 and 7.3. At the manufacturer’s request and with approval authority agreement, such limited-speed vehicles may be assigned to a specific family using the adjusted cycle described in Appendix 3 of Annex 4, with the same changes to be applied to UN GTR No. 24.

Proposal to amend and enhance the procedure for laboratory measurement of brake emissions for light-duty vehicles. The document provides comprehensive technical specifications covering scope and application for vehicles of categories M₁ and N₁, detailed abbreviations and symbols for measurement parameters, definitions of vehicle types and brake systems, application and approval procedures, conformity of production requirements with statistical evaluation procedures, and penalty provisions for non-conformity. Testing procedures include three sections: cooling air adjustment, brake bedding, and brake emissions measurement, all executed using the WLTP-Brake cycle comprising ten trips and 303 brake deceleration events. CoP verification shall be performed once every 12 months with samples from each brake corner emission family, evaluated according to decision charts specified in the regulation.

Status update on Euro 7 implementation for light-duty and heavy-duty vehicles. For LDV (M₁, N₁), application begins 30 months after Euro 7 entry into force for new types (29 November 2026) and 42 months for all new vehicles (29 November 2027). For HDV (M₂, M₃, N₂, N₃, O₃, O₄), application begins 48 months after entry into force for new types (29 May 2028) and 60 months for all new vehicles (29 May 2029). Small Volume Manufacturers comply from 1 July 2030 (M₁, N₁) and 1 July 2031 (M₂, M₃, N₂, N₃). Brake emissions apply 1 January 2030 for LDV and 1 January 2030–1 January 2035 for HDV. Tyre abrasion (UN R186) applies 1 July 2028 for C1 class tyres, 1 April 2030 for C2 class, and 1 April 2032 for C3 class.

This handbook provides testing and reporting procedures for the Third Inter-laboratory Study Phase 2, focusing on front brake testing for a Ford Puma vehicle per GTR No. 24. Testing comprises three emission cycles (Steps B and C with samples M₁ and M₂) followed by a fourth WLTP-Brake cycle (Step D) at 975 m³/h ± 10% airflow. Data must be reported using EBF, TBF, and MMF templates with specified formats and calculations. Post-test parts mass measurement occurs only after Step D completion. All values must be submitted as numerical values without formulae, with pre-test and post-test weighing procedures requiring buoyancy correction per GTR 24 specifications.

The Task Force reviewed and approved regulatory amendments for ADS-equipped vehicles across multiple UN Regulations. Key decisions included adopting a simplified and consistent definition of ‘vehicle user’ for light-duty and heavy-duty vehicles, retaining original wording for warning signal transmission to ADS systems, and amending engine torque terminology under UN R49. Amendments were reviewed for UN R49, UN R83, UN R115, UN R154, UN R177, UN R179, and UN R180, with focus on consistency regarding ADS testing modes and an additional 25 kg mass allowance for vehicles of categories X and Y. The Task Force acknowledged that ADS operation may result in additional energy consumption not fully reflected in current testing procedures and agreed to seek GRPE guidance on possible future work.

Agenda items include review of meeting minutes, overview of amendments to Brakes GTR 24 and UN R179, HD brakes and inertia considerations, projects on tyres and brakes including brake emissions from Phase 2 of the DfT Brake and Tyre Emissions Programme and characterization of brake particle emissions from electric vehicles, preliminary results of CPC inter-laboratory exercise on calibration materials, and any other business.

Draft amendments to the proposal to improve and correct the procedure for measuring laboratory brake emissions on light-duty vehicles (GRPE/2026/30). The document establishes scope and application for vehicles of category M₁ and N₁, defines abbreviations and symbols, sets compliance requirements with emission limits for PM10, and specifies test procedures including cooling adjustment, brake bedding, and emissions measurement sections using the WLTP-Brake cycle. It addresses brake corner emission families, type approval requirements, conformity of production testing at least once every 12 months with statistical pass/fail decision charts, and conformity assessment through verification procedures.

Draft amendments to the proposal to include testing of vehicles with limited speed (GRPE/2026/32). The document provides specifications for brake emissions testing including test-system requirements, climatic conditioning, brake dynamometer setup, sampling procedures, and data analysis methods for measuring particulate matter and particle number emissions from friction brake systems on light-duty vehicles.

Editorial corrections to the Appendix and reference to Annex 4.

Meeting minutes documenting PMP discussions on amendments to Brakes GTR 24 and UN R179, including TF3a layout and testing topics, TF3b vehicles limited speed work, TF3c brake replacement parts with a new UNR to be introduced, and TF4 electromechanical brakes with no further progress. GTR and UNR informal documents on HD brakes were presented with trailers removed from scope, open points on PM Emission Factor units, caliper position, test input parameters, and cooling air flow value addressed, and a 3-month delay in round robin testing reported.

Proposal to improve and correct the procedure for laboratory measurement of brake emissions for light-duty vehicles of categories M₁ and N₁. The regulation establishes requirements for brake particle emission testing including test setup, the WLTP-Brake cycle test procedure, cooling air adjustment, brake bedding, and emissions measurement sections. Compliance is demonstrated through brake corner emission family testing with PM₁₀ and SPN₁₀ measurements. Conformity of production is verified through periodic sampling and statistical evaluation. Type approval requires demonstration that whole vehicle brake emissions calculated from individual axle emissions multiplied by friction braking share coefficients do not exceed limits of 3 mg/km PM₁₀ for M₁ and N₁ vehicles and 5 mg/km for N₁ Class III and N₂ vehicles.

Overview of working documents for the 95th session of GRPE, listing five working documents on new GTR for heavy-duty brake emission, UN R179 second supplement, GTR 24 third amendment, vehicles with limited speed for UN R179 and GTR 24, and new UNR on emissions covering brake replacement parts, with informal documents to follow from clean working documents.

Agenda for a PMP webex meeting on 29 September 2026 to review meeting minutes, overview amendments to GTR 24 and UN R179 on brakes across multiple task forces covering layout and testing topics, vehicles limited speed, brake replacement parts, and electromechanical brakes, discuss GTR and UN R heavy-duty brakes, and address any other business.

Proposal to establish a new UN Regulation transposing UN GTR No. 24 into uniform provisions concerning approval of non-original and identical replacement brake parts (brake pads, drum brake linings, brake discs, and brake drums) with regards to particle emissions. The regulation applies to vehicles of category M₁, N₁, and N₂ between 3.5 and 5 tonnes maximum mass. Replacement brake parts must comply with particle emission limits, with emission factors calculated using test wheel load and friction braking share coefficient for the brake emissions family parent. Approval marks must be affixed to approved parts, and conformity of production shall be verified through sampling and testing procedures.

Proposal to establish a new supplement to UN Regulation No. 179, improving and correcting brake emissions measurement procedures for light-duty vehicles of categories M₁ and N₁. The regulation applies full-friction braking testing on brake dynamometers using the WLTP-Brake cycle comprising ten trips and 303 brake deceleration events. Testing includes three sections: cooling air adjustment, brake bedding with five cycle repetitions, and emissions measurement with three cycle repetitions. Compliance is demonstrated by measuring PM10 and SPN10 emissions from brake corner emission family parents, with whole-vehicle emissions calculated using friction braking share coefficients specific to vehicle electrification types. PM10 limits are 3 mg/km for M₁/N₁ vehicles and 5 mg/km for N₁ Class III/N₂ vehicles. Conformity of production requires annual testing of brake corner emission families with statistical evaluation per decision charts through 31 December 2029 (Phase I, PM10 only), with Phase II from 1 January 2030 evaluating both PM10 and SPN10. A version of this document with tracked changes is available.

Proposal to include testing of vehicles with limited speed. The document sets out the laboratory measurement procedure for brake emissions from light-duty vehicles of categories M₁ and N₁, including vehicles with maximum speed below the Base cycle maximum speed. Testing involves three sections: cooling air adjustment, brake bedding with five repetitions of the WLTP-Brake cycle, and brake emissions measurement with one WLTP-Brake cycle. Brake corner emission families are tested on a component test bench under full-friction braking conditions, measuring PM₁₀ and SPN₁₀ emissions. Compliance is demonstrated using brake corner emissions family parents. Conformity of production requires monthly sampling and testing of brake components, with results evaluated using statistical decision charts through 31 December 2029 for PM₁₀ and thereafter for both PM₁₀ and SPN₁₀.