What could be the effect of a strongly leaking air bellows have on road worthiness?

The combination of options 1 and 2 is correct because both directly relate to the effects of a strongly leaking air bellows on the vehicle's performance and safety.

Option 1 states that the vehicle can tilt to one side, which can compromise stability and control, leading to hazardous driving conditions. This is significant under German traffic regulations, which prioritize vehicle safety and proper road behavior.

Option 2 highlights that the brake action may be impaired due to incorrect control pressure of the automatic load-dependent braking force regulator (ALB). This is crucial, as inadequate braking efficiency can lead to accidents, particularly when the vehicle is under heavy load. According to German laws, vehicles must be in full working order to ensure the safety of all road users.

Option 3, while it may seem relevant, is not a direct consequence of a leaking air bellows. Instead, it relates to issues with the brake line itself, which is a different aspect of vehicle maintenance. Therefore, understanding both the implications of the air bellows and the specific brakes' function is essential for maintaining roadworthiness and adhering to the regulations.