TL* THE CONTACT OWNS A 2016 SILVERADO 1500. THE CONTACT STATED THAT WHILE DRIVING AT APPROXIMATELY 25 MPH, THE VEHICLE CRASHED INTO THE REAR OF ANOTHER VEHICLE. THE CONTACT INDICATED THAT WHEN DEPRESSING THE BRAKE PEDAL TO AVOID THE COLLISION THE MESSAGE "SERVICE BRAKE ASSIST" HAD DISPLAYED AND THE BRAKE PEDAL WAS HARD WHILE DEPRESSED. NO INJURIES WERE REPORTED. A POLICE REPORT WAS TAKEN AT THE SCENE AND THE VEHICLE WAS TOWED AWAY. THE CAUSE OF THE FAILURE WAS NOT YET DETERMINED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE LOCAL DEALER WAS NOT CONTACTED REGARDING THE FAILURE. THE FAILURE MILEAGE WAS 81,000.