You are driving a truck and trailer with a common compressed air-braking system. What is the function of the handbrake valve control setting here?

The selected combination of answers indicates that, when using the handbrake valve control setting, the towing vehicle is braked via the spring-loaded brakes, and the service brake of the trailer is released.

In German traffic regulations, this functionality is essential for ensuring the safety of truck and trailer combinations. The spring-loaded brakes provide a backup braking system that activates in the event of air pressure loss in the braking system, ensuring the towing vehicle slows down and remains controlled. Meanwhile, releasing the service brake of the trailer allows for smoother disconnection and parking of the trailer without causing unwanted movement.

Understanding this combination is crucial as it reflects the operational principles of air brakes in large vehicles, preventing accidents and maintaining control, especially in challenging situations. Such knowledge is vital for drivers to ensure safe operations while transporting goods.