UN R139 | Original text (2017) UN R139 Brake Assist Systems 00 series of amendments (2017) (Also published for convenience by WP.29 in UN R139.) Close	0
UN R139 | Original text | Supplement 1 (2018) UN R139 Brake Assist Systems 00 series of amendments | Supplement 1 (2018) (Also published for convenience by WP.29 in Amendment 1.) Close	0	1
UN R139 | Original text | Supplement 2 (2020) UN R139 Brake Assist Systems 00 series of amendments | Supplement 2 (2020) (Also published for convenience by WP.29 in Amendment 2.) Close	0	2