I have a 2004 Mercedes ML270 Auto, on AMG 20" wheels and wondered if anyone has come across or had a similar fault or any ideas as to what it might be. I have not had the ML long and there was a grating noise from the front end, it sounded like the pads required replacing even though the brake warning light was not lit the console. On inspection the front pads were low and the discs were worn, both have been replaced but the noise is still there. I have checked the rear brakes just in case and all is well. I have spun all the wheels individually to try and replicate the offending noise thinking it might be a wheel bearing, nothing, and there does not appear to be any discernible movement. I know jacking the car up and spinning the wheels is not the same as driving with over two ton resting on the wheels, but before I change the wheel bearings I thought I would ask the question. Just a couple of points, there is no vibration coming through the steering or car, the gears change smoothly, and everything feels as it should, just this noise. Hope you can help. Gary.