GAR | WP.29/2026/13

Document Title	UN R13: Proposal for a Supplement 8 to the 12 series of amendments
Reference Number	WP.29/2026/13
Date	31 Dec 2025
Summary	Proposal to: 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 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 provisions for the approval of e-axle trailers with regard to their “dynamo function”.
Rulemaking Area(s)	UN R13 Heavy-Duty Braking
Regulatory Impact	12 series of amendments \| Supplement 8
Proposal Status	Formal WP.29 review
Meeting(s)	WP.29 \| Session 198 \| 9-13 Mar 4.7.4. UN R13: Proposal for a Supplement 8 to the 12 series of amendments
Related Documents
	GRVA/2025/34	Proposal for amendments to UN R13 and 13-H on park lock device approval \| Superseded	change status?
	GRVA-23-07/Rev.2	Park lock device approval \| Superseded	change status?
	GRVA/2025/46/Rev.1	UN R13-H: Proposal for amendments \| Superseded	change status?
	GRVA-23-11/Rev.2	UN R13: Proposal for amendments \| Superseded	change status?
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