ACT Heavy Vehicle Knowledge Test Practice Questions - Heavy Vehicle Knowledge Test (Rigid Combination Road Rules Knowledge Test) Exam

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What is the purpose of an air-brake system's minimum air pressure build-up requirement before a heavy vehicle is driven?

To pre-condition the engine before starting To ensure the brakes have sufficient air pressure to stop the vehicle safely before moving To test the horn and warning systems To inflate the tyres automatically before the journey

Correct Answer:

To ensure the brakes have sufficient air pressure to stop the vehicle safely before moving

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