The contact owned a 2004 Hyundai Santa Fe. The contact stated that while the son was driving approximately 25 MPH the braking system malfunctioned and when depressing the brake pedal the vehicle did not reduce speed or stop causing the vehicle to crash into the rear of a second vehicle. During the crash, the rear driver-side passenger sustained a lacerated bottom lip and dental and oral injuries. A police report was taken at the scene and the vehicle was towed and later deemed destroyed by the insurance company. The cause of the failure was not determined. The manufacturer was notified of the failure. The local dealer was not contacted. The contact indicated that the vehicle was previously serviced for the same failure by the local mechanic. No further information was available. The failure mileage was 150,000.