On most audi's you can't vacuum bleed the clutch. I ran into the same problem on my 80. The easiest way to bleed it is get a small hand pump oiler, and some 5/16" clear fuel line. Put the fuel line on the end of the pump oiler, fit the other end on the bleeder. Fill the oiler with brake fluid, crack the bleeder and pump away. All it does is force fluid backwards in the system. Vacuum bleeding sucks the clutch master cylinder piston shut.
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