I WAS IN AN ACCIDENT ON THURSDAY, AUGUST 22 WHERE I SLAMMED INTO THE BACK OF ANOTHER VEHICLE ON THE ROAD. I HAD AT LEAST 40 FEET TO STOP AND I LITERALLY STOOD ON TEH BRAKES AND TRUCK BARELY SLOWED DOWN AND BEFORE COLLIDING WITH THE OTHER VEHICLE. I RECEIVED A LETTER FROM GM A FEW MONTHS AGO SAYING THE BRAKE ASSIST PUMP MAY BE FAULTY AND THAT I COULD GET IT REPLACED EVEN THOUGH IF IT WERE TO FAIL THE TRUCK WOULD STILL BRAKE WITHIN "STANDARD". I DIDNT THINK ANYTHING OF IT SINCE IT WASN'T DESCRIBED AS AN EMERGENCY AND I THOUGHT I WOULD HAVE TI TAKEN CARE OF THE NEXT TIME I TOOK THE TRUCK IN FOR SERVICE. MY WIFE HAD COMMENTED ON MY BRAKES FEELING SPONGY. AFTER THE WRECK I WAS SO DISTURBED BY HOW POORLY THE TRUCK RESPONDED TO FORCIBLY DEPRESSING THE BRAKES PEDAL THAT I STARTED RESEARCHING AND I FOUND WHERE NHTSA WAS INVESTIGATING THIS VERY ISSUE IN THE 2014-16 SILVERADOS AND I FEEL STRONGLY THAT MY ISSUE SHOULD BE INCLUDED IN THIS INVESTIGATION. THE TRUCK SHOULD HAVE STOPPED AND I THINK A RECALL SHOULD BE ISSUED. THE BRAKES DO NO OPERATE WITHIN "STANDARD" WHEN THE BRAKE ASSIST PUMP STOPS WORKING.