Ok I have abs. I just looked at my rear after removing the tire. I found nothing is wrong with the rear knuckle, but the whole disc seems to be bent at top about 5 degrees inward. I can really tell by looking straight from the back, the right tires are not straight.
What is the problem? I don't know... I guess it's the strut housing that is bent. I just bought the car, so I don't know.