replaced r front hub bearing assembly and still had same issue, issue is abs will cycle/activate brake (chatter sound), sometimes with this chatter the no traction control lite on dash lites up, sometimes the ABS service lite on center reader board lites up, this will happen several times a week or just a couple times a month, no real pattern. gone to auto parts shops and plug into scanner and guy just says ABS needs service. been doing this for several years now, started shortly after a warrenty engine swap at 27000 miles, changed hub around 70000, now has 90000