GAR | WP.29/2026/6

Document Number WP.29/2026/6

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Document title	UN R13: Proposal for a Supplement 2 to the 15 series of amendments
Date	22 Dec 2025				Proposal to Enable real-time reading of electrical transmission brake demand values via an OBD connector and scan tool during periodical technical inspections, Clarify that only one braking control (e.g., service braking control, parking brake control) shall be used for each test condition of the secondary braking effectiveness and to permit the selection of the braking control based on the vehicle load condition, and Establish definitions for “e-axle”, "e-axle trailer" and “dynamo function” and to establish provisions for the approval of e-axle trailers with regard to their “dynamo function”.

Status	Adopted by WP.29
Rulemaking area(s)	UN R13 Heavy-Duty Braking
Regulatory impact	15 series of amendments \| Supplement 2
Meeting(s)	WP.29 \| Session 198 \| 9-13 Mar Agenda item 4.7.1. UN R13: Proposal for a Supplement 2 to the 15 series of amendments
Related documents
	GRVA/2025/34		Proposal for amendments to UN R13 and 13-H on park lock device approval (Superseded)
	GRVA/2025/43		UN R13: Proposal for Supplement 1 to the 14 series of amendments (Superseded)
	GRVA/2025/46/Rev.1		UN R13-H: Proposal for amendments (Superseded)
	GRVA-23-07/Rev.2		Park lock device approval (Superseded)
	GRVA-23-11/Rev.2		UN R13: Proposal for amendments (Superseded)
	GRVA-23-18/Rev.1		UN R13 and 13-H: Proposal to amend documents GRVA/2025/43 and 44 (Superseded)
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