BRAKE LINE BURST AND WE LOST OUR BRAKES! SLOW SPEED AND RURAL LOCATION SO WE WERE ABLE TO STOP BY STEERING OFF-ROAD AND INTO SOME BUSHES. INSPECTED THE BRAKE LINES AND FOUND A LEAK IN THE STEEL LINE GOING TO THE LEFT FRONT BRAKE. THE BRAKE LINE HAD EXTENSIVE CORROSION ON IT AS WELL AS CORROSION ON ADJACENT LINES. THIS IS NOT A MAINTENANCE ISSUE, STEEL BRAKE LINES IN THIS PART OF THE COUNTRY DO NOT RUST OUT AT 67,606 MILES... EXCEPT ON THIS TRUCK. SHAMEFUL DESIGN AND POOR MATERIALS ARE THE CAUSE. SOMEBODY COULD HAVE BEEN INJURED OR KILLED!