APPROACHING A TRAFFIC LIGHT AT THE BOTTOM OF A STEEP GRADED HIGHWAY, I NOTICED THE BRAKE PEDAL FELT SPUNGEY AND NEAR THE BOTTOM THE BRAKE PEDAL WENT CLEAR TO THE FLOOR BOARD. I WAS FORCED TO LEAVE THE HIGHWAY TO PREVENT A REAR END COLLISION WITH THE STOPPED VEHICLE IN FRONT OF ME RESULTING IN NO REAL DAMAGE TO THE VEHICLE ITSELF. IT COULD HAVE BEEN MUCH WORSE. THE BRAKE LINES (4 OF THEM) HAVE RUSTED OUT SO MUCH THAT THEY COULD NOT CONTAIN PRESSURE OF THE FLUID WHEN APPLYING THE BRAKE AND BURSTED. MY MECHANIC TELLS ME THIS WILL BE IN EXCESS OF $600.00 TO REPAIR DO TO THE CAB HAVING TO BE UNBOLTED AND LIFTED FROM THE CHASSIS TO ACCESS THE LINES FOR REPLACING. HE ALSO TELLS ME THAT MANY GM MODELS, NEW AND OLD HAVE THIS PROBLEM WITH RUSTING BRAKE LINES. GM IS AWARE OF THESE PROBLEMS. WHY HAS THIS NOT BEEN ADDRESSED? WHY HAVE THESE MODELS NOT BEEN RECALLED? SUBARU RECENTLY RECALLED OVER 660,000 VEHICLES FOR THE SAME PROBLEM; #DOINGTHERIGHTTHING. I AM NOT AT ALL HAPPY ABOUT THIS. *JS