APPROACHING INTERSECTION THE STOP LIGHT CHANGED AND ATTEMPTING TO STOP VEHICLE, THE BRAKE PEDAL WENT TO FLOORBOARD, BUT DID NOT STOP VEHICLE BEFORE IMPACT WITH ANOTHER VEHICLE. SPEED AT IMPACT WAS APPROX. 20 MPH AND NEITHER AIRBAG DEPLOYED. JUST RECENTLY HAD VEHICLE AT DEALERSHIP TO HAVE SOFT BRAKE PEDAL CHECKED, AND WAS TOLD OF OTHER COMPLAINTS CONCERNING SAME PROBLEM. *JB