METHOD FOR CHECKING AN ELECTROHYDRAULIC VEHICLE POWER BRAKE SYSTEM OF AN AUTONOMOUSLY DRIVING LAND VEHICLE FOR THE PRESENCE OF AIR IN THE BRAKE FLUID

To check an electrohydraulic power vehicle brake system of a passenger car traveling autonomously on public roads for air in the brake fluid, the method provides for a consecutive generation of a brake pressure using a first power brake-pressure generator and a redundant, second power brake-pressure generator. The brake pressure is intermittently lowered to ambient pressure. In the method, a comparison of the brake fluid volumes required for generating the brake pressure is provided. If the brake fluid volume required for generating the brake pressure using the second power brake-pressure generator is greater, then the presence of air in a brake fluid of the vehicle brake system is inferred.