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MOTOR VEHICLES (STANDARDS) REGULATIONS - AUSTRALIAN VEHICLE STANDARDS RULES
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.