In the last week or so my front end started to hum when I got up to 20 mph and above. I experienced this problem before with the wheel bearings going bad but have recently replaced both of them in the front. The sound is coming from the front passenger side wheel. I replaced the caliper, brakes, bearing, and had the rotors cut and it still hums. I got fed up and took it to a garage to have it looked at. The guy took it for a ride and came back and said that it sounds like the front wheel assembly is bad. Could this be the problem?? What else should I check for??