WAS TRAVELING 45-50MPH & WOULD APPLY BRAKES, AND THEY WOULD LOCK UP. REAR ABS BRAKES DO NOT WORK PROPERLY. REAR ENDED ANOTHER VEHICLE. AIR BAGS FAILED TO DEPLOY DUE TO A LACK OF BRAKES. VEHICLE SLIDE 100 FT BEFORE THE IMPACT HAPPENED. THERE WERE NO INJURIES. *AK