I have a 2011 Chevy Impala. I replaced the hub bearing assembly on the rear wheel and as I was replacing it, I noticed the rotor on the left-rear side was dragging. As I turned the wheel, the rotor would drag, then be free, then drag again. Naturally I figured it was either the hub bearing that I was already replacing or the rotor itself being warped. After finishing the bearing job, I noticed the same problem, so, I went ahead and replaced the rotor. To my disappointment, that also didn’t solve the problem. It was the exact same behavior. As I was turning the rotor, I could see it move in and out relative to the caliper bracket as if this new rotor, too, was warped, but I find it hard to believe I’d get a brand new rotor that was warped in the same way.
What else could possibly be causing this problem? I’ve tried searching online, and all the stuff I’m seeing is about warped rotors and bad hub bearing assemblies, but seeing they’re brand new and the problem existed before, I think I can rule that out. I figure if the caliper were out of alignment or the whole wheel was out of alignment, the dragging would be constant and not only on part of the rotation.