On Sunday, 3/14/2004, I was driving my 2004 Ford Expedition on dry pavement when the vehicle began to shake with acceleration (15-20 mph). I checked to be sure there were no flat tires and proceeded. Once the vehicle was up to 45-50 mph I attempted to brake and the vehicle's brakes did not properly respond. The brake pedal began to vibrate and shake but the vehicle did not slow down. I applied the brakes harder and the vehicle came to a slow stop. Once the vehicle stopped a warning buzzer sounded and the vehicles message center stated "check advtrac". the advtrac feature disabled and I was able to drive the vehicle home safely. The next day, (today 3/15/04), I drove the vehicle to the Ford dealership without event. The dealership had no idea what the problem was but stated they would contact Ford and let me know. This event took place on a clear paved dry flat road. Fortunately, there were no other cars in my path of travel. Had there been, a collision would have occurred due to the failure of the braking system. The vehicle has 2014 miles and the VIN is [xxx]. the vehicle was being operated in the "2high" mode. This is a serious system failure related directly to the advtrac system. Update 07/30/2012 information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6)

- Canandaigua, NY, USA