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National Transport Commission (Road Transport Legislation – Vehicle Standards) Regulations 2006
143Brake line couplings
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143 Brake line couplings
(1) Brake line couplings on the same part of a vehicle in a B‑double or road train must not be interchangeable. (2) The couplings must be polarised in accordance with Australian Standard 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 brake couplings are used for the same purpose as the hoses mentioned in the standard.