Why is a decrease of pressure of more than 0.7 bar problematic in the compressed air system of a motor vehicle, if you press the brake pedal fully down one time (cut-off pressure around 10 to 13 bar)?

The selected options are correct because both concerns address critical aspects of vehicle safety and functionality regarding the braking system.

1. A decrease in air supply can lead to insufficient pressure for additional braking operations, making it impossible to stop effectively in emergency situations. This aligns with regulations that emphasize the importance of consistent braking performance for vehicle safety.

2. The deterioration of braking action due to reduced pressure is a major safety issue. German traffic regulations mandate that vehicles must have reliable braking systems to protect both the driver and other road users. If the braking force is compromised, it can lead to longer stopping distances or total brake failure, which may result in accidents.

These points highlight the importance of maintaining proper pressure in the air supply system to ensure effective braking performance and compliance with traffic safety standards.