The contact owns a 2016 Ford Flex. While the contact’s husband was driving at an undisclosed speed, the brake pedal was depressed; however, the vehicle failed to stop as needed. The contact stated that the vehicle independently accelerated instead of stopping. The vehicle was taken to the dealer; however, the cause of the failure was not yet determined. The vehicle was not diagnosed or repaired by an independent mechanic or the dealer. The contact stated that the failure had occurred several times. The manufacturer was not made aware of the failure. The failure mileage was approximately 40,000.