I WAS PULLING INTO A PARKING SPACE IN A HIGH SCHOOL PARKING LOT FOR MY SON'S BASKETBALL TOURNAMENT. AS A APPLIED THE BRAKES TO COME TO A COMPLETE STOP, MY TRUCK WOULD NOT STOP. I ENDED UP HITTING A PARKED CAR AND A CEMENT LIGHT POLE. MY TWO DAUGHTERS WERE IN THE TRUCK WITH ME AND WE WERE UNDERSTANDABLY SHOOK UP AND EMOTIONAL. THE NEXT DAY I RECEIVED A LETTER IN THE MAIL FROM GM ABOUT THE MECHANICAL VACUUM PUMP OUTPUT MAY DECREASE AT LOW SPEEDS. I BROUGHT MY TRUCK INTO THE DEALERSHIP IMMEDIATELY AND THEY DIAGNOSED THAT THE VACUUM PUMP NEEDED TO BE REPLACED. I AM CURRENTLY WAITING FOR GM TO REPLY IN REGARDS TO HOW THEY WILL HANDLE THE DAMAGE TO MY TRUCK AND THE OTHER VEHICLE I HIT.