STARTED APPLYING BRAKES AFTER GOING 30MPH. VEHICLE DID NOT SLOW DOWN OR STOP. REARENDED SEVERAL VEHICLES. UPON IMPACT, AIRBAGS DID NOT DEPLOY. LEFT FRONT WHEEL CAME OFF. PRIOR TO IMPACT, CV JOINT MADE KNOCKING NOISE WHEN TURNING. TOOK TO DEALER TWICE FOR KNOCKING NOISE. *AK