I've also read that warping a disc is a pretty unlikely event - just how hot would they have to get to warp that much metal anyway?
I had a long running battle with this too and, whilst I agree that bushes are a likely candidate for the cause of the problem if it's shuddering when you're not braking, other factors may be in play, as David suggests.
My problem started after I'd had new discs, refurbished calipers and new pads. It was great for 2-3K miles, then the shuddering started and got worse. New discs and pads under warranty cured it, but the same happened again after 2-3K miles. And again!
The cure was to get the discs skimmed in situ. They weren't warped, just not quite in line for whatever reason. And it was confounded by a rear caliper seizing a little. Been fine now for at least 15K miles.
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2002 Final Edition S8. Ebony black with Silver Grey leather and myrtle wood trim. Current mods: solar sun roof, 20mm rear spacers, 15 mm on front, red brembo callipers, 6k headlights, rear view camera, engine remap, alloy dash dial rings, alloy navi rings, tt/phaeton pedal upgrade, (and custom matching foot rest) dension ipod interface & parrot hands free kit (both fully hidden), av input, tv in motion switched thro' PF switch in blanking plug right of steering column, Audi 'quattro' sill covers, repositioned centre console switches, radio clock, .
Planned mods: auto-dimming rear view mirror, dash cam (as steamship's), fit the ski hatch, refit philips drl's (or maybe not - nope, definitely not - horrible botch!).
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