AF Commercial Driving Theory Practice Questions - Afghanistan Driving License Theory Test - Commercial & Heavy Vehicle Exam

What happens when air pressure in a heavy vehicle's pneumatic system drops completely to zero while driving?

The powerful mechanical spring parking brakes (maxi brakes) automatically engage and lock the rear wheels The brakes release completely, leaving the vehicle to coast with no retardation The service brakes continue to work normally from a reserve air supply The engine shuts down automatically and the vehicle rolls to a halt

Correct Answer:

The powerful mechanical spring parking brakes (maxi brakes) automatically engage and lock the rear wheels

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