GAR | WP.29/2026/6

Document Title	UN R13: Proposal for a Supplement 2 to the 15 series of amendments
Reference Number	WP.29/2026/6
Date	23 Dec 2025
Summary	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”.
Rulemaking Area(s)	UN R13 Heavy-Duty Braking
Regulatory Impact	15 series of amendments \| Supplement 2
Proposal Status	Formal WP.29 review
Meeting(s)	WP.29 \| Session 198 \| 9-13 Mar 4.7.1. UN R13: Proposal for a Supplement 2 to the 15 series of amendments
Related Documents
	GRVA/2025/43	UN R13: Proposal for Supplement 1 to the 14 series of amendments \| Superseded	change status?
	GRVA-23-18/Rev.1	UN R13 and 13-H: Proposal to amend documents GRVA/2025/43 and 44 \| Superseded	change status?
	GRVA/2025/34	Proposal for amendments to UN R13 and 13-H on park lock device approval \| Superseded	change status?
	GRVA-23-07/Rev.2	Park lock device approval \| Superseded	change status?
	GRVA/2025/46/Rev.1	UN R13-H: Proposal for amendments \| Superseded	change status?
	GRVA-23-11/Rev.2	UN R13: Proposal for amendments \| Superseded	change status?
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