WHILE DRIVING ON THE HIGHWAY IN STOP AND GO TRAFFIC THE BRAKE PEDAL WENT TO THE FLOOR WHEN DEPRESSED. WHEN THIS OCCURRED THE BRAKES FAILED TO STOP THE VEHICLE. THIS RESULTED IN THE VEHICLE REAR ENDING THE MOTORIST IN FRONT OF THEM. THE EMERGENCY BRAKE WAS ENGAGED TO STOP THE VEHICLE. THE VEHICLE IS CURRENTLY AT A BODY SHOP, BUT WILL BE TOWED TO THE DEALERSHIP TO HAVE THE BRAKES INSPECTED. *AK