If I can chip in, while it is not S8 but they are all similar anyway.
The previous owner replaced whole callipers because of failed motors on my 4.2TDI with cheap (ish) units in the past because at that time cheap A8 motors on their own were not available, only A6 without sensors so it must have been a few years ago now. They are still working fine but they are definitely louder than OEM motors I have heard on other 8's. Same with A6 rear wiper motor, OEM was not audible and while the aftermarket work just fine they are a lot more noisy.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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