2/2/18. WAS TRAVELING AT 47 MPH WHEN A TRUCK STOPPED IN FRONT OF ME. I WAS APPROXIMATELY 10 CAR LENGTHS AWAY. I HIT THE BRAKE TO STOP, FELT THE PEDAL VIBRATE FOR A FEW SECONDS AND THEN THE PEDAL WENT TO THE FLOOR AND THE VIBRATION WENT AWAY. PUMPED THE PEDAL AGAIN AND SLOWED THE VEHICLE AND WAS ABLE TO GET OVER TO THE RIGHT BEFORE HITTING THE TRUCK. THE AIR BAGS DID NOT DEPLOY, THE AUTO STOP FEATURE DID NOT WORK. THE ONSTAR DID NOT ACTIVATE.THE ROADS WERE DRY, AND THE ROAD WAS FLAT. GM SENT SOMEONE TO RETRIEVE THE DATA FROM THE COMPUTERS, WE HAVE COPIES OF THE REPORT. THE DATA SHOWS 5 SECONDS BEFORE THE CRASH. ACCORDING TO THE BRAKING DATA, THE BRAKE WAS APPLIED AT 47 MPH AND THE VEHICLE SLOWED BUT DID NOT STOP. AFTER GETTING THE VEHICLE BACK FROM THE BODY SHOP, WE HAD THE CODES PULLED AND FOUND NUMEROUS CODES IN THE DIFFERENT MODULES. THERE WAS A CODE U0415-71- INVALID DATA RECEIVED FROM ELECTRONIC BRAKE CONTROL MODULE PRESENT AS A HISTORY CODE. WE TOOK THE VEHICLE TO A CHEVY DEALER AND THEY CONFIRMED ALL THE SAME CODES. WE HAD TO TAKE THE CAR BACK TO THE ORIGINAL DEALER THAT DID THE BODY WORK IN CASE IT WAS ACCIDENT RELATED. THE SECOND DEALER IS CLAIMING THAT EVEN THOUGH CODES ARE PRESENT THERE IS NOTHING THEY CAN FIND WRONG. I BELIEVE THE ABS FAILED ON THIS VEHICLE AND WAS THE DIRECT CAUSE OF THE ACCIDENT.