The contact owns a 2004 Kia Spectra. The contact stated the cruise control feature was not operating properly. The contact stated while her boyfriend was driving and approaching a traffic light, when depressing on the brake pedal the vehicle failed to stop and accelerated independently to 80 mph. The contact stated no warning light was illuminated. The driver was able to stop the vehicle by using the emergency brakes and parked on the side of the road. The vehicle was not drivable. The vehicle was towed to her residence. The contact stated while inspecting the vehicle, they noticed the cruise cable was not in place was separate from the box. The contact also stated she saw the area was black/burned. The contact called local dealer and them aware of the failure. The vehicle was not diagnosed or repaired.The manufacturer had not been informed of the failure. The failure mileage was approximately 121,000.