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In a heavy vehicle, the bursting of a pneumatic braking system line and consequent loss of pressure means that:
AThe vehicle rolls freely and, as such, becomes uncontrolled;
BThe vehicle becomes uncontrolled, even with a buzzer operating;
CThe spring cylinders brake the wheels.Correct
Explanation
In heavy vehicles equipped with pneumatic braking systems, there is a safety device that uses spring cylinders. These cylinders keep the springs compressed by air pressure during normal operation. If a sudden loss of pressure occurs due to a burst line, the absence of air causes the springs to expand automatically, applying the brakes and safely immobilizing the vehicle. In this way, the vehicle does not become uncontrolled or roll freely, as this passive safety system ensures immediate braking of the wheels in the event of a serious failure in the compressed air circuit.
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