oxblood!z28

I've had this squeak problem for sometime now and was wondering if the back wheels or hubs have bearings that need possible regreasing. I've replaced the rotors, brakes, calipers and relubed everthing, but this sound is still around. I really want to get to the bottom of this cause its annoying...it does disappear when i apply the brakes. any ideas?

oxblood!z28

anybody?