WHILE DRIVING ON LOCAL ROAD, TRAFFIC STOPPED AHEAD. I PRESSED THE BRAKES, BUT IT DID NOT RESPOND. THE COLLISION WARNING AND EMERGENCY AUTO-STOPPING SYSTEM ALSO DID NOT ENGAGE, CAUSING THE VEHICLE TO COLLIDE WITH THE CAR IN FRONT. TWO DAYS BEFORE THE COLLISION, THE TESLA RECEIVED A FIRMWARE UPDATE. I NOTICED THE DRIVING BEHAVIOR WAS SLIGHTLY DIFFERENT. BRAKE FAILURE LIKE THIS NEVER HAPPENED BEFORE THIS FIRMWARE UPDATE. THE FIRMWARE VERSION WITH THIS ISSUE IS 2019.5.4. 4C3C414