I haven't done this myself. But as far as I can discover.
http://www.audipages.com/Tech_Articl...rakebleed.html seems to suggest 1 liter.
According to my workshop manual, see attached file
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Johannes
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Audi S8 -99, Pearlescent, Alcantara/silk napa leather, Burr walnut insert, Alcantara roof lining upper pack
A8 32V engine
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Jeep Grand Cherokee -98
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