I had a similar problem some years ago. Vibration above 60 and worse the faster you go. Tried everything and nothing helped.
Then checked calipers. On one side one of the pistons was jammed slightly further forward than the others. When I got up to 60 the heat created expanded the metal and it touched the disc intermittently so was vibrating one side of the front of the car (but felt like whole car).
Got caliper refurbished and never had a problem since.
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2002 S8 Aqua Pearl, entirely original apart from FE 20" OEM wheels and Milltek exhaust.
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