Motor Vehicles (Standards) Regulations - Australian Vehicle Standards Rules

(1) The braking system of a trailer with a GTM over 2 tonnes must allow the driver of a motor vehicle towing the trailer to operate the brakes from a normal driving position.

(2) However, subrule (1) does not apply to an unloaded converter dolly that weighs under 3 tonnes if the motor vehicle towing the converter dolly has a GVM over 12 tonnes.

(a) operate automatically and quickly if the trailer breaks away from the towing vehicle; and

(b) remain in operation for at least 15 minutes after a break‑away; and

(c) be able to hold the trailer on a 12% grade while in operation after a break-away.