WHILE DRIVING AT 35 MPH AN EMERGENCY SITUATION REQUIRED A HARD APPLICATION OF THE BRAKES. THE VERY NEXT STOP SIGN MY BRAKE PEDAL WENT ALL THE WAY TO THE FLOOR. THE TRUCK WAS LEAKING BRAKE FLUID AT ABOUT A DROP EVERY SECOND FROM ONE OF THE HARD METAL BRAKE LINES THAT ARE ROUTED UNDER THE DRIVER'S SEAT ALONG THE FRAME. THERE ARE FOUR BRAKE LINES THAT ARE ROUTED TOGETHER AND COULD NOT TELL WHICH ONE WAS LEAKING. EACH OF THEM IS HEAVILY RUSTED. *TR