2004 CHEVROLET SILVERADO 1500. COMPLETE BRAKE FAILURE, TO THE FLOOR, ON THE INTERSTATE HIGHWAY. I HAD TO GO OFF THE ROAD TO AVOID HITTING OTHER VEHICLES. GM SAYS THE DUAL SYSTEM PREVENTS THIS ? NOT TRUE. MY MECHANIC INFORMS THAT BRAKE LINE CORROSION AND FAILURE ON GM TRUCKS IS A KNOWN AND VERY COMMON PROBLEM, DUE TO INFERIOR METAL USED IN THE BRAKE LINES. GM IS DENYING RESPONSIBILITY FOR THE MOST CRITICAL SAFETY ITEM ON THEIR TRUCKS ! WHAT IS NHTSA DOING ???? *TR