Moin,
zitiere hier b. homburg (und ich glaube das ist eindeutig):
Sorry für "Neudeutsch", aber die Aussage ist schlicht: NEIN
All V8s sold anywhere in the world left the factory equipped with the UFO brakes until the very end of that model. Absolutely no exceptions. For model year 1992, there were indeed made some changes to the front suspension components (mainly to be able to use the same parts as on the then new C4) but the UFO brakes remained on the car.
The Girling G60 brake from the substantially lighter and less powerful 10V Audi 100/200 you are referring to used to be dealer-retrofitted (with factory backing) as an "emergency quick fix" to some 1990 cars in the North American markets (US/Canada) when and after owners complained about warping (and repeated rotor changes did not fix the issue) ONLY. This conversion was done solely to pacify select angry customers who otherwise would have dumped their $50k cars and shopped elsewhere, leaving Audi with another PR disaster just after the corporate image barely recovered from the 'unintended acceleration' media nightmare and tried to tap into the big-prestige market for the first time.
Audi stopped doing this at some time in 1991 anyway. If you´d ask for this today, they tell you “no”.
The G60 brake you are talking about is absolutely inadequate and totally overburdened by the power and weight of the V8 except maybe for the most sedate driving styles and environments - spirited driving is a no-no as is mountain driving...Remember, we`re talking about a two-ton car that goes 159 mph (257 km/h) - at least that`s what my 4.2 is capable of
(European) V8 owners dissatisfied with the replacement cost and performance of the UFO brakes today mostly convert to the "HP2" front brake setup found in the V8-powered "C4" S4 and the later S6 (1992-1996) as well as the D2 A8. If you are in the US, the strut/brake assembly from a 1995/96 S6 would fit right in.
In Europe, used components for this HP2 conversion are plentiful and cheap to come by; replacement rotors cost only a fraction of the UFO parts and every parts store carries them; warping is no longer an issue even on the track and fade resistance is improved somewhat compared to the UFOs. And when opting for the smaller of the two available sizes (there are 314 and 322 mm diameter versions around, the latter being used in the S8 or the S6+) you can retain the stock wheels.
