Had a similar problem on my 87 Passat GL5 once though without the wheel vibration from what I can remember. Started off as a clunk then eventually manifested into steering play when steering round a bend. I would steer normally then I'd have to steer a bit more as some play came in... tuned out to be loose wishbone bolts causing the wishbone to slip.
Did have a problem with intermittent front wheel vibration on an Audi 100 once which turned out to be a partially seized outer CV joint knuckle.
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Current:
99 Subaru Forester S-Turbo Auto - interesting... but it's not a quattro
91 Reliant Scimitar SST 1400 - no.39 of 42... something for the weekend
Previous:
Two consecutive 1989 Audi 200 Quattro Turbo Avant, 1B
1990 Audi 100 SE Avant, NF
1986 Audi 100 CD Avant, KU
1987 VW Passat GL5E Estate, JS
"Honorary" triple member of the 200,000+ Club 
Audi 200 in the UK (legacy website)
Classic Audi member no: 258
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