What about the brakes? This includes the E-Brake. Get the car up on a lift and have a buddy put the car in gear and accelerate. Then stand near the rear wheel in question and listen for where the noise is exactly coming from.
Wheel bearings don't typically, at least I've never heard it, make a knocking sound.
It would be nice to have a video or sound file. Preferably video.
Last edited by SamDoe1; 05-21-2012 at 06:42 PM.