The contact owns a 2020 BMW 530I. The contact stated that while driving at 20 MPH, the contact depressed on the brake pedal desperately, but the vehicle would not stop, causing the contact to rear-end the vehicle in front. There were front end damages to the contact's vehicle and rear end damages to the other vehicle. No warning light illuminated. The contact sustained head injuries that required medical attention. The driver in the other vehicle suffered injuries to the shoulders and the neck that required medical attention. A police report was filed. The vehicle was towed to the dealer. The vehicle was diagnosed by the dealer who stated no failure was found but the failure reoccurred. The vehicle was repaired by the insurance company. The manufacturer was contacted and stated that the vehicle was inspected by a tech and stated no failure was found. The failure mileage was 700.