I hear a grinding sound when I curve to the left. It sounds like it is the hub bearing. But, Im not sure which side to replace. I just purchased the discs 2 a month ago. The previous owner let the car sit for a couple of months causing the brakes to pulsate. I think rotors got warped. I will be replacing brakes.
Jack up the front wheels and feel the movement in the wheel bearings (pull wheel top to bottom in a rocking motion, there should be no movement) if the noise is only on full lock, check that the steering bump stop is not screwed in to far or loose as this can cause the wheel to rub on the lower control arm, look at this as well.