Text based upon a proposal from CLEPA and OICA as adopted by the Working Party on Brakes and Running Gear (GRRF) at its 74th session to harmonize UN R13-H with the Federal Motor Vehicle Safety Standard (FMVSS) 135 on electric vehicle requirements with regard to the regenerative braking system (RBS).
Proposal to clarify and update transitional provisions, including provisions for extensions of type approvals granted according to the antecedent requirements of the original approval. These amendments also relate to the transfer of brake-related telltale provisions to UN R121.
Proposal for the 01 series of amendments to Regulation No. 13-H
Reference Number: WP.29/2016/50
Proposal to delete provisions for electronic stability and brake-assist systems from UN R13-H as part of their transposition into new stand-alone regulations. This proposal also clarifies the requirements on electromagnetic compatibility via reference to Regulation No. 10.
This proposal (WP.29/2016/50) was adopted by the World Forum. Thirty-seven Contracting Parties out of the 48 applying UN R13-H were present for the vote by AC.1. Thirty-seven voted in favor with zero against and zero abstaining.
UN R13-H: Proposal for Supplement 17 to the 00 series of amendments
Reference Number: WP.29/2018/8
Proposal to enable activation of the ESC optical symbol in cases of a corrective steering function intervention when the CSF intervention is activated under the control of an ESC system. The aim is to avoid separate requirements for brake-actuated and steering-actuated vehicle stability functions (VSF) that would lead to two optical warnings where only one is necessary. This would enable use of the ESC intervention tell-tale for CSF steering intervention.
This proposal (WP.29/2018/8), as amended by para. 89, was adopted by the World Forum. Thirty-six Contracting Parties out of the 49 applying UN R13-H were present for the vote by AC.1. Thirty-six voted in favor with zero against and zero abstaining.
This proposal (WP.29/2018/54) was adopted by the World Forum. Thirty-five Contracting Parties out of the 50 applying UN R13-H were present for the vote by AC.1. Thirty-five voted in favor with zero against and zero abstaining.
UN R13-H: Proposal for Supplement 2 to the 01 series of amendments
Reference Number: WP.29/2021/13
Proposal to improve the uniformity of requirements for stop lamp illumination with regard to various types of braking systems, including those of electric vehicles.
This proposal (WP.29/2021/13) was adopted by the World Forum. Thirty-seven Contracting Parties out of the 52 applying UN R13-H were present for the vote by AC.1. Thirty-seven voted in favor with zero against and zero abstaining.
UN R13-H: Proposal for Supplement 3 to the 01 series of amendments
Reference Number: WP.29/2021/73
Proposal to improve the uniformity of requirements for stop lamp illumination with regard to various types of braking systems, including those of electric vehicles.
This proposal (WP.29/2021/73) was adopted by the World Forum. Thirty-eight Contracting Parties out of the 52 applying UN R13-H were present for the vote by AC.1. Thirty-eight voted in favor with zero against and zero abstaining.
UN R13-H: Proposal for Supplement 4 to the 01 series of amendments
Reference Number: WP.29/2022/79
Proposal from GRVA to clarify paragraph 5.2.22.2. with regard to the deceleration thresholds for generating the braking light signal in the case of regenerative braking and/or automatically commanded braking.
Proposal to ensure the continuity of the American Society for Testing and Materials (ASTM) Method E1337 for the measurement of the Peak Braking Coefficient (PBC) in UN Regulation No. 140, by introducing a reference to the new ASTM Standard Reference Test Tyre F2493.
Proposal to align UN R13-H with technical advances and the emergence of a new type of braking system that employs stored electrical energy for both the control transmission and the energy transmission.
This proposal (WP.29/2024/147), as amended by para. 105, was adopted by the World Forum. Thirty-seven Contracting Parties out of the 55 applying UN R13-H were present for the vote by AC.1. Thirty-seven voted in favor with zero against and zero abstaining.
UN R13-H: Proposal for a Supplement 1 to the 02 series of amendments
Reference Number: WP.29/2026/14
Proposal to
Enable real-time reading of electrical transmission brake values during periodical technical inspections, and
Clarify that the Emergency Stop Signal (ESS) may be generated by application of the service braking system via the Electronic Parking Brake (EPB) control.
UN R13-H: Proposal for a Supplement 6 to the 01 series of amendments
Reference Number: WP.29/2026/15
Proposal to clarify that the Emergency Stop Signal (ESS) may be generated by application of the service braking system via the Electronic Parking Brake (EPB) control.
UN R13-H: Proposal for a Supplement 2 to the 02 series of amendments
Reference Number: WP.29/2026/8
Proposal to enable the type approval of ADS vehicles, including those without manual controls (to be considered during the June 2026 WP.29 session at the time of consideration of the proposed new regulations on ADS).