I was riding my motorcycle with a group of bikes and had to make an emergency stop. When the brakes were applied, as directed in the owners manual, the ABS failed and caused the rear tire to lock and skid. The resulting skid caused a loss of control of the motorcycle and ultimately laying the bike down on the asphalt highway. This resulted in the rider and passenger sustaining injuries. The passenger received a Tramatic Brain Injury which a month and a half later she is still in recovery. The motorcycle has not yet been repaired or looked at by any Police or Technical personnel. There were no warnings or lights prior to the accident.