You park a trailer with compressed air-braking system for a short period. How can you disengage the service brake of the trailer?

To disengage the service brake of a trailer with a compressed air-braking system, it's important to recognize that this process can often involve multiple actions. In this case, the correct approach includes both activating the release valve and venting the brake line.

Activating the release valve allows you to release pressure from the braking system, while venting the brake line ensures that air can flow out, effectively disengaging the brakes. Simply releasing the parking brake may not be sufficient on its own, as it only affects the parking brake mechanism and does not fully disengage the service brake system, which is crucial for safe and effective operation of the trailer.

Understanding this process is important for compliance with German traffic regulations, which emphasize the correct operation of braking systems for safety on the road. Properly disengaging brakes helps prevent accidents and ensures that the trailer can be safely moved or parked without risk of unintended movement.