GRVA/2026/35
UN R13: Proposal for amendments
Source(s)
CLEPA
Date
3 Jul 2026
Status
GR approved as amended
Subject
Meeting(s)

Proposal to amend para. 2.8 of Annex 8 to add a new requirement that braking forces from combined service and parking braking systems shall hold a laden trailer as required in Annex 4 para. 3.2.1 at any time when service brake energy reservoir pressure reduces from 850 kPa to 0 kPa, ensuring continuous trailer immobilisation during service brake pressure depletion while establishing a performance-based requirement rather than prescribing specific technical solutions.

Downloads
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Related documents
GRVA-26-37/Rev.1
UN R13: Proposal to amend GRVA/2026/35 (Approved by GR)
Excerpts from session reports
GRVA | Session 26 | 14-18 Sep

65. The representative of CLEPA proposed amendments to Annex 8, paragraph 2.8., of UN Regulation No. 13 (Heavy Vehicle Braking) and introduced document ECE/TRANS/WP.29/GRVA/2026/35, aimed at providing greater flexibility in the design of systems intended to hold a trailer on an 18 per cent slope. GRVA reviewed informal document GRVA-26-37.

66. GRVA adopted ECE/TRANS/WP.29/GRVA/2026/35, as amended by Annex X to this report (based on GRVA-26-37/Rev.1), and requested the secretariat to submit it as draft Supplements 10, 8, 5 and 4 to the 12, 13, 14 and 15 series of amendments to UN Regulation No. 13 to WP.29 and AC.1 for consideration and vote at their March 2027 sessions.

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