How do you have to disconnect the air lines when detaching a trailer?

When attaching or detaching a trailer, it is crucial to follow the correct procedure for disconnecting the air lines to ensure safety and proper functioning. In this case, the emergency line (red hose coupler) must be disconnected first to ensure that the braking system remains functional until the last moment. This is crucial for preventing uncontrolled movement of the trailer.

If the hose couplers are combined, disconnecting both lines at the same time is also permitted, as this method ensures that the trailer is disconnected cleanly and safely without prolonged exposure to potential issues in the air line system.

Following these procedures aligns with German traffic regulations, which emphasize the importance of safety and proper handling of vehicle systems to prevent accidents and ensure effective trailer braking. Understanding and applying these rules when operating vehicles with trailers is essential for every driver.