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National Transport Commission (Road Transport Legislation – Vehicle Standards) Regulations 2006
145Capacity of air reservoirs
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145 Capacity of air reservoirs
(1) The capacity of the air storage tanks of a motor vehicle used in a B‑double or road train must be at least 12 times the volume of all the brake activation chambers on the motor vehicle. (2) The capacity of the air storage tanks of a trailer used in a B‑double or road train must be at least 8 times the volume of all the brake activation chambers on the trailer.