The contact owns a 2019 Chevrolet Malibu. While the contact's wife was driving at an undisclosed speed, the brake pedal was depressed; however, the vehicle failed to stop as intended. No warning light was illuminated. The contact stated that the brake pedal was depressed to the floorboard however, the vehicle failed to stop. The contact stated that the failure caused the vehicle to crash into a nearby ditch. In addition, the contact stated that the failure caused severe damage to the vehicle, and the vehicle was undrivable. The contact used a code reader to diagnose the vehicle a retrieved a code for a brake booster back-up pump failure. The dealer was made aware of the failure. The vehicle was not diagnosed or repaired by an independent mechanic or the dealer. The manufacturer was made aware of the failure but provided no assistance. The contact referenced an unknown recall repair however, the VIN was not included in the recall. The failure mileage was approximately 63,455.