The contact owns a 2021 Audi Q7. The contact stated that while driving approximately 50 MPH, the vehicle came to an abrupt stop. The contact went forward and sustained a concussion, and blurred vision and medical attention was provided. The emergency brake malfunction message was displayed. The vehicle was taken to the local dealer where they were unable to duplicate the failure. The vehicle was not diagnosed or repaired. The manufacturer was notified but no additional assistance was provided. The approximate failure mileage was 52,000.