One night while driving home from work I hear a big thump like I drove over a rock or something, then the next thing you know I hear this hi pitch humming sound coming from the passenger side and just continued to get louder and louder unless I was stepping on the brakes. Next day I took it to the shop and they said the wheel bearings were bad. So I had them replaced and two weeks later back for the same thing. I had it fixed again and about three weeks later same problem so I took it to a different shop. $356.00 later I drive away. Now it has been about 5 months and guess what, yesterday my car starts it all over again. Not sure what it is now but definitely related to rotors, bearings or brakes again. Toyota suck's.