In the case of a failure in one of the control lines connecting two vehicles equipped according to paragraph 5.1.3.1.2 the trailer shall use the control line not affected by the failure to ensure, automatically, the braking performance prescribed for the trailer in paragraph 3.1 of Annex 4.
Punkti 5.1.3.1.2 kohaselt varustatud kaht sõidukit ühendavatest juhtahelatest ühe rikke korral peab rikkest puutumata juhtahel automaatselt tagama haagise pidurdamise 4. lisa punktiga 3.1 ettenähtud tõhususega.