THE VEHICLE WAS MOVING SLOWLY IN TRAFFIC RAMAPO VALLEY ROAD (AKA RT 202) IN OAKLAND NJ WHEN I APPLIED THE BRAKES. THE BRAKE PEDAL WOULD NOT MOVE AND THE VEHICLE WOULD NOT STOP, I TRIED TWICE BEFORE STEPPING ON THE EMERGENCY BRAKE. AT THE SAME TIME I STEPPED ON THE EMERGENCY BRAKE I HIT THE CAR IN FRONT OF ME CAUSING NO DAMAGE TO THE VEHICLE BUT MY VEHICLE HAS A DENT IN THE FRONT BUMPER FROM THE TOW HITCH ON THE CAR I HIT. THERE WERE NO INJURIES REPORTED AT THE SCENE. THE POLICE OFFICER ARRIVED AND MOVED MY TRUCK CONFIRMING THERE WAS A BRAKE FAILURE. THE POLICE OFFICER MOVED MY TRUCK TO A DRIVEWAY ACROSS THE ROAD AND A MESSAGE REGARDING A BRAKE ASSIST FAILURE DISPLAYED ON THE DASH. NO INDICATION WAS DISPLAYED AT THE TIME OF THE ACCIDENT. THE POLICE OFFICER DECLARED THE VEHICLE UNSAFE TO DRIVE AND HAD IT TOWED AND IMPOUNDED. AFTER GETTING A VEHICLE RELEASE MY TRUCK WAS TOWED TO THE DEALERSHIP IN LITTLE FALLS NJ WHERE THE SERVICE SUPERVISOR CONFIRMED THE BRAKE VACUUM PUMP FAILED. I WAS CONTACTED BY GM AND GAVE THEM INFORMATION REGARDING THE ACCIDENT. THE SERVICE SUPERVISOR INFORMED ME GM INVESTIGATORS WERE GOING TO THE DEALERSHIP TO INSPECT THE FAILURE. I FOUND A GM SERVICE BULLETIN DATED JUNE 2016, BULLETIN NUMBER PIT5361B DESCRIBING THIS FAILURE. I AM IN THE PROCESS OF TRYING TO GET GM TO PAY FOR THE DAMAGES SINCE THE TRUCK IS LESS THAN 5 YEAR OLD AND HAS LESS THAN 100000 MILE ON IT, IT HAS ABOUT 45000 MILES ON IT. THIS PART IS NOT A PART THAT IS EXPECTED TO WEAR O