UN Regulation No. 139: Brake Assist Systems

Uniform provisions concerning the approval of passenger cars with regard to brake assist systems

Related groups: GRRF and GRVA
UN R139 (2017)
30 Jan 2017 2017-02-03 09:14:25 UTC 00 series of amendments Based upon the adopted proposal: WP.29/2016/61

Proposal for a new UN Regulation based upon brake-assist system provisions extracted from UN R13-H in order to facilitate work on the international whole vehicle type approval system.

UN R139 | Amendment 1 (2019)
16 Jan 2019 2019-01-25 09:36:24 UTC 1 00 series of amendments | Supplement 1 Based upon the adopted proposal: WP.29/2018/60

Proposal to clarify the purpose of UN R139 which was originally established through the extraction of brake assist system (BAS) provisions from UN R13-H on brake systems. Within the context of UN R13-H, the BAS provisions were written to assess performance in cases where a vehicle was fitted with a brake assist system. As a stand-alone regulation, UN R139 applies only to vehicles that are equipped with BAS. Therefore, this supplement proposes to refine the text to remove the “if fitted” language and ensure that UN R139 can only be applied to a vehicle equipped with a BAS.

UN R139 | Amendment 2 (2020)
29 Jan 2020 2020-02-18 10:17:55 UTC 2 00 series of amendments | Supplement 2 Based upon the adopted proposal: WP.29/2019/48

Proposal to clarify that UN R139 does not mandate the installation of brake assist systems (BAS) on vehicles but rather specifies requirements for the approval of vehicles should they be equipped with a BAS system.

Earlier texts may be available through the UN Official Document System.