TL* THE CONTACT OWNED 2017 GMC SIERRA LD. THE CONTACT STATED THE VEHICLE WAS SERVICED FOR NHTSA CAMPAIGN NUMBER: 19V645000 (SERVICE BRAKES, HYDRAULIC) AT LOCAL DEALER DON JOHNSON MOTORS CHEVROLET BUICK GMC (734 WEST AVE, RICE LAKE, WI 54868), HOWEVER, THE FAILURE REOCCURRED. THE CONTACT STATED WHILE DRIVING 70 MPH TRAFFIC HAS STOPPED. THE BRAKE PEDAL WAS DEPRESSED HOWEVER THE VEHICLE FAILED TO STOP,CAUSING THE VEHICLE TO HIT ANOTHER VEHICLE AND GUARDRAIL.THE CONTACT STATED THAT THE AIR BAGS DEPLOYED. THE CONTACT STATED NO WARNING LIGHT WAS ILLUMINATED. A POLICE REPORT WAS FILED. THE VEHICLE WAS TOWED TO A TOW ARD, AFTER ELEVEN DAYS IT WAS TOWED TO LOCAL DEALER PALM CHEVROLET (2300 SW COLLEGE RD, OCALA, FL 34471) WHERE IT WAS DIAGNOSED THAT THE VACUUM PUMP, SENOR ,AND A BELT NEEDED TO BE REPLACED.THE VEHICLE HAD NOT BEEN REPAIRED AS OF YET. THE CONTACT STATED THE VEHICLE WAS TRADED FOR A 2018 CHEVY IMPALA.THE MANUFACTURER HAD BEEN INFORMED OF THE FAILURE AND A CASE WAS OPENED. THE FAILURE MILEAGE WAS APPROXIMATELY 38,000. *BF *AS