Swiss Category C Theory (Truck) Practice Questions - Switzerland Driving Theory Test - Category C (Heavy Motor Vehicles) Exam

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What is the purpose of the Four-Circuit Protection Valve (Vierkreisschutzventil) in a heavy vehicle compressed air braking system?

To distribute hydraulic fuel to four engine cylinders To control the four cabin speaker volume levels To ensure that if one brake circuit suffers a pressure drop or air leak, the remaining circuits (Circuit 1 rear, Circuit 2 front, Circuit 3 parking/trailer, Circuit 4 auxiliary) maintain operational safety pressure To switch between four different transmission speeds

Correct Answer:

To ensure that if one brake circuit suffers a pressure drop or air leak, the remaining circuits (Circuit 1 rear, Circuit 2 front, Circuit 3 parking/trailer, Circuit 4 auxiliary) maintain operational safety pressure

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