2000 Chevrolet Suburban 1500

I WAS BACKING UP MY 2000 CHEVY SUBURBAN 1500 IN MY DRIVE WAY AND THE BRAKES FAILED COMPLETELY WHILE BACKING UP THE VEHICLE. THE BRAKE PEDAL WENT ALL THE WAY TO THE FLOOR. I PUMPED THE BRAKES SEVERAL AND THE PEDAL WENT TO THE FLOOR EACH TIME. THERE WAS NO WARNING THAT THE BRAKES WERE GOING TO FAIL. I WAS ABLE TO USE THE EMERGENCY BRAKE TO STOP THE VEHICLE. THE REAR BRAKE LINE IS SEVERELY CORRODED AND THE LINE FAILED AT THE CHASSIS LOCATION ABOVE THE REAR AXLE ABOVE THE COIL SPRING BRACKET. THERE WAS A LARGE ABOUT OF BRAKE FLUID ON THE INSIDE OF THE TIRE, CHASSIS AND ON THE GROUND. THIS FAILURE ALSO INDICATES THE MASTER CYLINDER FAILED BECAUSE THERE WERE NO FRONT BRAKES EITHER. UPON INSPECTION, ALL THE BRAKE LINES ON THE VEHICLE ARE SEVERELY CORRODED AND WILL NEED TO BE REPLACED. I AM DISAPPOINTED IN GM ENGINEERS TO PRODUCE A VEHICLE THAT COULD HAVE A FAILURE OF THIS NATURE. THEIR DESIGN CONTROLS AND PROCESS USING A DFMEA (DESIGN FAILURE MODE AND EFFECTS ANALYSIS) WOULD HAVE HAD CORROSION ON BRAKE LINES AS A POTENTIAL FAILURE MODE. IF THEIR MARKETING KNOWS THAT A LARGE PERCENTAGE OF VEHICLES WOULD BE SOLD INTO REGIONS THAT USE CORROSIVE AGENTS TO KEEP OUR ROADS AND HIGHWAYS CLEAN IN THE WINTER, THEN THEY SHOULD HAVE SHOWN THAT THE BREAK LINES COULD FAIL GIVEN THEIR CHOICE IN BRAKE LINE MATERIALS AND COATINGS USED ON THIS VEHICLE. ALSO, I AM DISAPPOINTED IN MY GM DEALER AND THE STATE SAFETY INSPECTION PROCESS WHERE I LIVE THAT SHOULD ALSO HAVE CAUGHT THE FACT THAT THE BRAKE LINES WERE SEVERELY CORRODED, ESPECIALLY SINCE I HAD TO HAVE HAD MY REAR BACKING PLATES REPLACED ON THE SAME VEHICLE LAST YEAR DUE TO A CORROSION FAILURE THAT RENDERED THE EMERGENCY BRAKES USELESS AND WOULD NOT PASS THE STATE INSPECTION PROCESS. *TR