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there are only two things that can CAUSE vibration[depending on how tight the steering is it can get amplified by other things]you have had the tires balanced properly so one down ,what about the brake rotors?a warped rotor will also cause vibration although usually at a specific speed as it tries to knock the pad back into the caliper[and vibration under brakes may not yet be apparent] i had the same issue with my own 420sel and that was the issue.
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