I get a roaring sound from right front wheels -- is my wheel bearings the problem, if yes, is there some documentation to change it/regrease them (which grease)?

The noise is annoying and is more predominant while coming to stop, can't really hear the sound on a highway.

 

I have this problem, but only when I turn the wheel. I was just putting on new rotors and I noticed that my dust shield or somethign like that form my brakes was warped and rubbing the rotor when the wheel was turned. I hope it is only that simple for you!!