Steering wheel shimmy/jerk in my Audi 90S

[Tony Urban]

Hi All,
 
I have a 1993 Audi 90S which has been giving me some worries recently.
When I brake or just take my foot off the gas, I can feel a vibration in
the steering wheel.  Occasionally, it gets more severe and really begins
to jerk.  I never feel this problem at high speeds(50+), only when
braking and/or letting off the gas.  It also recently starting making a
loud creaking/knocking sound when I make turns.  It's louder on left
turns but can be heard when I make rights too.  
 
I'm wondering if it might be something with a tie rod/ball joint/etc.
but was wondering if anyone else has had this problem or has any ideas
on what could be causing this.
 
Many thanks!
 
Tony Urban
Crazy Ralph Films