ABS BRAKE FAILURE; WHEN APPLYING THE BRAKES TRUCK SLOWED DOWN A LITTLE, BUT DID NOT COME TO A COMPLETE STOP, CAUSING DRIVER TO REAREND ANOTHER VEHICLE. THIS HAPPENED ON DRY PAVEMENT, NO INCLEMENT WEATHER. DRIVER HAD PLENTY OF BRAKING DISTANCE. THE AIR BAGS DID NOT DEPLOY WHEN THIS HAPPENED. THE TRUCK WAS TOWED TO THE DEALER WITH MAJOR BUMPER DAMAGE. *AK