GAR | WP.29/2026/11

WP.29/2026/11

UN R13: Proposal for a Supplement 3 to the 14 series of amendments

Source(s)

Date

23 Dec 2025

Status

Adopted

Subject

Impact

14 series of amendments | Supplement 3

Meeting(s)

WP.29 | Session 198 | 9-13 Mar

Agenda item 4.7.2. UN R13: Proposal for a Supplement 3 to the 14 series of amendments

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,
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”.

Downloads

UNECE server

Related documents

Excerpts from session reports

GRVA | Session 22 | 2-6 Jun 2025

66. During the consultations, the expert from OICA proposed to clarify (GRVA-22-06) the provisions for Electric Parking Brakes (EPB) to ensure consistent interpretation of the activation conditions for an Emergency Stop Signal (ESS), meaning that the ESS can be generated by application of the service braking system via the EPB control. He also proposed to clarify that the use of any braking system control for testing the effectiveness of the secondary braking system in failure conditions is allowed (GRVA-22-10).

67. GRVA postponed the review of ECE/TRANS/WP.29/GRVA/2025/34 until September 2025.

68. GRVA agreed to remove ECE/TRANS/WP.29/GRVA/2025/13 and ECE/TRANS/WP.29/GRVA/2025/14 of the agenda for the next session.

69. During the consultations, the experts reviewed the proposal tabled by the expert from CLEPA to amend UN Regulation No. 13 (GRVA-22-25 as well as GRVA-22-26 amending ECE/TRANS/WP.29/GRVA/2025/15) in order to allow for the approval of e-axles. They noted the urgency for some parties to adopt these amendments as well as the need to address final open issues regarding testing and validation.

70. GRVA noted the status report on activities regarding the development of e-axle provisions (GRVA-22-25).

71. GRVA agreed to keep ECE/TRANS/WP.29/GRVA/2025/15 and GRVA-22-26 on the agenda for the September session and also agreed to resume discussion on the basis of an updated version.

72. GRVA requested the secretariat to distribute GRVA-22-06 and GRVA-22-10 with official symbols at the next session.

WP.29 | Session 198 | 9-13 Mar

With 34 of the 54 Contracting Parties applying UN R13 present and voting, AC.1 adopted document WP.29/2026/11 by a vote of 34 in favor, 0 opposed, with 0 abstaining.