What would cause loud idling sound , jerking motion and unresponsive brakes to a 2001 audi tt (manual transmission) after adding brake fluid?

SOURCE: 2001 Audi TT All Wheel Drive. At normal speeds

sounds like the front drive shaft universal joint has failed. to check lift front and wiggle the shafts at the rubber boots is there and side to side motion? should be no slosh only smooth rotation if there is replace drive shaft

SOURCE: I have 2001 Audi tt

common problem which audi uk dont want to recognise but ironically audi usa did after immense pressure from the owners club.mine does the same and i live with it as the brakes work ok and i can throw the car into the tightest of corners at speed and the car does not roll,yaw left or right ans stays where it should.The fault is inherent with the year build.you can have your own dash pod recallibrated at a cost of around £250 by a british company but there is no real solution or gaurantee

SOURCE: 2001 Audi tt manual transmission. Car won't start

Starter,battery cables, Starter relay, Neutral safety switch . One of these items are holding you up.

SOURCE: My Audi TT 2001 traction light comes on every now

This is a sensor, it will need replacing, it cost me around £60

SOURCE: Audi A6 Quattro wagon loud squeaking when

Hi,
it means there is a problem on the wheels.
Better check the brakes and wheel bearing.
You could have free check up in any underchasis & brakes shop. They would even clean your brakes and make some estimate for the parts and services they would provide.
Hoe that solves your problem!
Thanks for using Fixya!