What can cause the filling time of an air brake system to be longer than normal?

Your answer is correct because both leaking air tanks or connectors and inadequate air compressor performance can cause the filling time of an air brake system to be longer than normal. In German traffic regulations, the air brake system relies on a properly functioning compressor to build up pressure efficiently. If there is a leak, air escapes, slowing down the pressure build-up. Similarly, if the compressor is not working well, it cannot supply enough air quickly. However, too much water in the air tanks does not directly affect the filling time but can cause other issues like corrosion or brake failure if not drained. Understanding these points helps ensure air brakes are maintained safely and work reliably.