2000 CHEVROLET SUBURBAN 2500 Steering Problems

I NOTICED MY 2000 CHEVROLET - SUBURBAN K2500 VEHICLE PULLING TO THE LEFT AT LIGHT TO MODERATE BRAKING. NOTICED OIL LIKE STAINS TO UNDER SIDE OF DRIVERS FRONT WHEEL WELL AREA. I HAD IT INSPECTED BY A CERTIFIED SERVICE STATION. DURING INSPECTION THEY FOUND A LEAK COMING FROM THE BRAKE HYDRO BOOSTER, AND POWER ASSIST HIGH PRESSURE HOSES. I WAS TOLD THAT THE HYDRO BOOSTER NEEDED REPLACING, ALONG WITH THE TWO LINES COMING FROM THE HYDRO BOOSTER, AT A COST OF $1200.00. I WAS TOLD THAT THE DRIVER COULD LOSE COMPLETE POWER ASSIST TO THE STEERING AND BRAKES, CAUSING A POTENTIALLY HAZARDOUS DRIVING CONDITION. G.M. IS RESPONSIBLE FOR MAINTAINING RELIABLE SAFETY COMPONENTS FOR ALL THEIR VEHICLES. UNDER THE NHTSA CAMPAIGN ID NUMBER: 05V005000, UNDER THE NOTES SECTION: GM CAMPAIGN NO. 05001. THIS ACTION IS DEEMED A SAFETY IMPROVEMENT CAMPAIGN AND IS NOT BEING CONDUCTED UNDER THE SAFETY ACT. THE COMPANY...