DRIVING OUR '04 SIENNA AT ABOUT 30-40 MPH IN FLOW WITH TRAFFIC WITH ABOUT 30-40 YARDS OF SEPARATION HAD TO BRAKE FOR SUDDENLY STOPPING TRAFFIC IN FRONT WHEN BRAKE PEDAL WENT TO THE FLOOR WITH SHOCKING MUSHINESS FAILING TO STOP IN TIME RESULTING IN TOTALING OF OUR VEHICLE AND SIGNIFICANT DAMAGE TO VEHICLE WE STRUCK. *TR