My Lexus has started to make a strange clicking noise while driving. I thought at first I had a screw or something in my tire. Checked all of the tires and there was nothing. I also removed all the tires checked the brake pads which were fine, and lubed the brakes. The clicking won't stop and I have no idea what else it could be. It clicks while driving and clicks faster as I accelerate. Any ideas?? THANKS!