Grinding noise when turning left or right.

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I have a 2002 Yukon 4WD. I detect a low roaring/grinding noise from left front wheel area when I turn left or right into a drive way or parking slot. I thought it to be the whell bearings so I had them replace not that: Then I had the brake served and replaced the rotors and pads. Not That either. There are a lot of things to replace under the front end