Heavy Vehicle (Vehicle Standards) National Regulation

Brake line couplings on the same part of a heavy vehicle in a B-double or road train must not be interchangeable.

Brake line couplings on a heavy vehicle in a B-double or road train must be polarised in accordance with AS D8-1971 ‘Hose Couplings for Use with Vacuum and Air-Pressure Braking Systems on Prime Movers, Trailers and Semi-trailers’ if the hoses used with the couplings are used for the same purpose as the hoses mentioned in that standard.

In this section—brake line coupling means a device used to connect equipment between vehicles in a heavy combination for the purpose of ensuring brakes applied to the towing vehicle are also applied to the other vehicles in the combination.