UN R13 Base text (15 series) · UNECE Regulation No. 13 (ECE R13) — Uniform provisions concerning the approval of vehicles of categories M, N and O with regard to braking.
UN R13 — 15 series of amendments
Changes from 14 series of amendments (supplement 1)
- What changed
- Paragraph 5.1.2.4.2. now says at which mass the endurance braking system must maintain an average speed of 30 km/h.
- Annex 4, paragraph 1.8.1.2. no longer limits the test mass to 26 tonnes for N3 vehicles authorized to tow an O4 trailer.
- New paragraphs 12.9. to 12.9.7. set transitional provisions for the 15 series, with dates of 1 September 2029 and 1 September 2031.
- Why
- The original text on the mass to be tested could potentially be misinterpreted.
- The endurance brake acts only on the towing vehicle, so the test needs to cover the mass of the full vehicle combination.
- Industry said that it needs a new series of amendments, given the increase of the endurance braking performance requirements.
Q1What changed11 changes
Endurance braking performance and test mass (para. 5.1.2.4.2.; Annex 4, paras 1.8.1.2. and 1.8.2.1.)
Paragraph 5.1.2.4.2. now says at which mass the endurance braking system must maintain an average speed of 30 km/h on a seven per cent down-gradient. It is the maximum vehicle mass or, for a motor vehicle authorized to tow an O4 trailer, the maximum combination mass, up to 44 tonnes. Before, paragraph 5.1.2.4.2. did not state a mass. For N3 vehicles authorized to tow an O4 trailer, Annex 4, paragraph 1.8.1.2. no longer has the 26-tonne test mass limit. The rule to take an unladen mass above 26 tonnes into account by calculation is also deleted. In paragraph 1.8.2.1., the test at maximum mass is now “as relevant to demonstrate the performance specified in paragraph 5.1.2.4. of this Regulation”.
Transitional provisions for the 15 series of amendments (paras 12.9. to 12.9.7.)
From the entry into force of the 15 series, Contracting Parties applying this Regulation must not refuse to grant or accept 14 series type approvals. As from 1 September 2029, Contracting Parties applying this Regulation need not accept type approvals to the preceding series first issued after that date. Until 1 September 2031, Contracting Parties applying this Regulation must accept type approvals to the preceding series first issued before 1 September 2029. As from 1 September 2031, Contracting Parties applying this Regulation need not accept type approvals to the preceding series. Despite paragraph 12.9.4., they must continue to accept approvals to the preceding series for vehicles not affected by the 15 series changes. Contracting Parties applying this Regulation may grant type approvals, and must continue to grant extensions of existing approvals, to any preceding series.
Q2Why it changed
- Proposed by
- Expert from Germany; changes to the administrative provisions by the experts from OICA and CLEPA
- Working party
- GRVA, 20th session (September 2024)
Reasons
ECE/TRANS/WP.29/GRVA/2024/37 aimed at clarifying the testing provisions for endurance braking. The original text on the mass to be tested could potentially be misinterpreted. The endurance brake brakes only the towing vehicle, not the trailer. For traffic safety, it must withstand the mass of the full vehicle combination. So the test needs to cover the mass of the combination, not just the mass of the towing vehicle.
Sources (4)
“The representative of Germany recalled the purpose of ECE/TRANS/WP.29/GRVA/2024/37 (superseding ECE/TRANS/WP.29/GRVA/2024/22), aimed at clarifying the testing provisions for endurance braking.”
“The original text of the regulation, with regard to the mass to be tested, could potentially be misinterpreted.”
“The endurance brake, braking only the towing vehicle, but not acting on the trailer, must withstand the mass of the full vehicle combination in order to ensure traffic safety.”
“The test therefore needs to cover the mass of the combination, not just the mass of the towing vehicle.”
Test provisions were shifted from the scope, paragraph 1.8.1. and its subparagraphs, to the section that describes the test conditions, paragraph 1.8.2. and its subparagraphs.
Source
“Test provisions have been shifted from the scope, paragraph 1.8.1. and its subparagraphs, to the section describing the test conditions, paragraph 1.8.2. and its subparagraphs.”
In ECE/TRANS/WP.29/GRVA/2024/22, industry suggested amending paragraph 5.1.2.4., which defines the performance requirements of the endurance braking system. The aim was to state without ambiguity that the required performance does not depend on the test mass in Annex 4, paragraph 1.8.2.1. Industry also proposed that paragraph 1.8.2.1. refers directly to paragraph 5.1.2.4., to avoid duplicating other parts of the text.
Sources (5)
“industry suggests amending the paragraph 5.1.2.4. of the body of the regulation, which defines the performance requirements of the endurance braking system”
“without ambiguity on the fact that the required performance is not depending on the test mass specified in Annex 4, paragraph 1.8.2.1.”
“Paragraph 1.8.2.1. is modified in order to avoid duplicating other parts of the text”
“the proposed modifications are now directly referencing the relevant paragraphs”
“Paragraph 5.1.2.4. for the required performance”
In ECE/TRANS/WP.29/GRVA/2024/22, industry said that it needs a new series of amendments, given the increase of the performance requirements of the endurance braking system. Industry also said that an increase of the performance requirement may require a re-design of vehicle powertrains, cooling concepts and/or battery concepts.
Sources (2)
“Industry does have a need for a new series of amendments, given the increase of the performance requirements of the endurance braking system.”
“An increase of the performance requirement may require a re-design of vehicle powertrains, cooling concepts and/or battery concepts (for battery electric vehicles)”
Proposer's reason (informal document GRVA-20-47)
OICA and CLEPA said that the proposed series 14 should be series 15, because GRVA adopted the EBSIG amendment as series 14 in June. Industry supported keeping the “new types” date in 2029, but needed an extra year for “All types (New vehicles)”, from 2030 to 2031. One reason was the 9 months that had elapsed since GRVA-18, when the transitional provisions dates were proposed. Industry also said that a 2-year lead time between the two dates fits better with the intense pace of the latest R13 series.
Submitted by the experts from OICA and CLEPA. Working party adoption: ECE/TRANS/WP.29/GRVA/20, para. 91.
Sources (5)
“Editorial correction: the proposal for a new series 14 should be series 15, since the EBSIG amendment has been adopted at June session of GRVA as series 14.”
“Industry supports keeping the “new types” date in 2029, as per document GRVA/2024/37, but needs an extra-year for the application on “All types (New vehicles)”, from 2030 to 2031.”
“A reason is the 9 months elapsed since the GRVA-18”
“when the transitional provisions dates were proposed.”
“Furthermore, a 2 years lead-time between NT and AT dates is more in line with the intense pace of the latest R13 series of amendment”
Document trail
- 2023-11ProposalECE/TRANS/WP.29/GRVA/2024/7First attempt by the expert from Germany to clarify the Regulation
- 2024-04ProposalECE/TRANS/WP.29/GRVA/2024/22Proposal for a new series of amendments by the experts from CLEPA and OICA
- 2024-07ProposalECE/TRANS/WP.29/GRVA/2024/37Proposal by the expert from Germany, superseding ECE/TRANS/WP.29/GRVA/2024/22
- —Amended in sessionGRVA-20-47Amendments to ECE/TRANS/WP.29/GRVA/2024/37 by the experts from OICA and CLEPA
- —Working party adoptsECE/TRANS/WP.29/GRVA/20GRVA session report, para. 91
- 2024-12Sent to WP.29ECE/TRANS/WP.29/2025/6Text that GRVA sent to WP.29 and AC.1
- 2025-03WP.29 adoptsECE/TRANS/WP.29/1184Adopted at the 195th session (session report, para. 109)
- 2025-09-26In forceC.N.501.2025.TREATIES-XI.B.16.13UN depositary notification
Q3Who is affected
Vehicle manufacturer
- For vehicles authorized to tow an O4 trailer, check endurance braking at the maximum combination mass, up to 44 tonnes.
- For N3 vehicles authorized to tow an O4 trailer, plan Type-IIA tests without the deleted 26-tonne test mass limit.
- Note that, from 1 September 2029, Contracting Parties need not accept preceding-series approvals first issued after that date.
- Note that, from 1 September 2031, Contracting Parties need not accept preceding-series approvals, except under paragraph 12.9.5.
- Check which of your vehicles are not affected by the 15 series changes (para. 12.9.5.).
Component supplier
- Give endurance braking data at the maximum combination mass (up to 44 tonnes) for vehicles authorized to tow O4 trailers.
Technical service / Approval authority
- Check that the Type-IIA test mass is the maximum vehicle or combination mass relevant to paragraph 5.1.2.4.
- Do not apply the deleted 26-tonne test mass limit to N3 vehicles authorized to tow an O4 trailer.
- Check approvals to the preceding series against the dates in paragraphs 12.9.2. to 12.9.4.
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ⓘ This report gives advice only. It is not legal or type-approval advice.
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- 12 series — Supplement 1
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