WAS TRAVELING 40MPH WHEN ANOTHER VEHICLE CUT IN FRONT & HAD NO TAIL LIGHTS. APPLIED BRAKES TO AVOID HITTING VEHICLE. HAD PUMPED BRAKES, BUT VEHICLE HAD SLID & REARENDED THE OTHER VEHICLE DUE TO LACK OF BRAKES. UPON IMPACT WITH OTHER VEHICLE, AIR BAGS FAILED TO DEPLOY. *AK