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.

Presentation on brake inertia determination for potential amendment to heavy-duty brake emission protocol. Currently proposed protocol assumes test inertia determined based on UN R90, but comparison with C-factor from vehicle testing showed significant differences in inertia and actual load during dynamometer testing, with front and rear values differing by up to 2.3 times. Proposes retaining UN R90-based approach as default method while adding alternative inertia determination method considering vehicle mass and multi-axle configurations. Analysis of 43 Japanese market vehicle models showed UN R90-based approach can result in brake loads ranging from 0.1 to 5.7 times those of vehicle-based approach.

Document outlining the 1st DETA/IWVTA Workshop held on 17 June 2026 in Flensburg, Germany. The workshop covered presentations on what DETA and IWVTA are, industry and government expectations, and issuance and acceptance of IWVTA certificates in the EU. Survey responses from 15 participants, including from Southeast Asian countries, indicated needs for more explanation on DETA access rights, onboarding processes for new Contracting Parties, and clearer guidance on how IWVTA can be modified to suit individual markets. Suggestions included developing supporting materials and guidelines on IWVTA application procedures and organizing a second workshop in Japan or Asia.

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 amend Annex 1B, paragraph 1. to clarify that the name and address of manufacturer’s representative shall be provided if applicable, followed by the manufacturer’s name and address.

Proposal to amend Annex 1B, paragraph 1 to read ‘If applicable, name and address of manufacturer’s representative’ followed by ’Manufacturer’s name and address’.

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 amend Annex 3, paragraph 1.1.1. to delete the sub-paragraph referring to bedding of brake linings according to manufacturer’s instructions. A defined bedding procedure of brake linings was introduced in paragraph 1.1.2. of Annex 3 with Supplement 9 to the 01 series of amendments to UN Regulation No. 90. The last sub-paragraph of paragraph 1.1.1 had not been deleted in Revision 2 and 3 of UN Regulation No. 90, leading to different interpretations of the bedding procedure, which this proposal resolves.

In GRPE, discussions regarding control of aftermarket brake components with regard to brake particle emissions have prompted CLEPA’s desire to have access to type approval information to enable development of these components. Vehicle manufacturers make considerable investment in deriving these data and a supplier typically does not offer all affected brake components making a simple compliance test more difficult. OICA and CLEPA members are coming closer to an agreement regarding the necessary data, reducing the amount of data to be shared. A similar situation has been identified between UN R13H and UN R90.

Proposal to amend Annex 1B, paragraph 1. to add “If applicable,” before “name and address of manufacturer’s representative” and to renumber the existing paragraph 2 as paragraph 1. This proposal resolves inconsistency between communication forms 1A and 1B of UN R90. The term used for responsible entities, the manufacturer’s representative, was modified only in communication form 1A for replacement brake lining assemblies and replacement drum brake linings, so communication form 1B for replacement brake discs and replacement brake drums requires the same amendment to ensure consistency.

Proposal to amend paragraph 1.1.1. to insert a new footnote 7 defining replacement brake lining assemblies; amend footnote 4 referencing the Consolidated Resolution on the Construction of Vehicles; and amend Annexes 3, 4, 7, 11, and 14 to establish special provisions for vehicles equipped with an Automated Driving System, including dedicated activation methods for braking tests, demonstration requirements for test activation method accuracy, recording of braking demand in test reports, and speed limitations at 90 per cent of v_max for vehicles of categories X and Y.