Changes made by Council Directive of 26 July 1971 on the approximation of the laws of the Member States relating to the braking devices of certain categories of motor vehicles and of their trailers (71/320/EEC)
EU Directive 1971/320
No changes made by Council Directive of 26 July 1971 on the approximation of the laws of the Member States relating to the braking devices of certain categories of motor vehicles and of their trailers (71/320/EEC) are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.