Ive had ALOT of trouble with my front driver said wheel bearing. I changed 2 bearings, the hub, and finally the axle. Finally my bearings have stopped wearing out but now i have a new "problem", if i can call it that. When my wheel moves, a sort of high pitch noise comes out from the wheel area. It gets really really annoying when i hear the echo while the windows are open. Ive heard suggestions of something with the seal not being positioned right but that doesnt seem like it would be the case. I also think the guard is posibly touching but that wouldnt make the noise that high pitched, i tryed my hardest to bend the guard away but i still think its touching (probably nothing to do with the high pitch sound).

 

Is it a high pitched wine that comes after you drive for a while, you hear it at slower speeds, around town 30-40 mph?

If so, pull your axle out and put grease on the hub's inner dust seal.
Problem solved.

 

Just a bump to say that this worked for me. I had changed my bearing a year and a half ago, and did not grease things enough...