I have a 2006 Audi A4 3.2L Quattro. And every time I turn the steering wheel all the way, wether its left or right, it starts to vibrate a feels shaky. I took to the dealer and they told me that it's normal because it has the Quattro system and that all audis that have it do it. If anyone knows anything about it please notify me.

 

I noticed the same thing on my 2.0L quattro.
When I get close to the parking spot and start maneuvering for the back parking, usually I turn the wheel all the way to the right. It does indeed have that tremor especially towards the end of the trip. Also, I noticed that the the bigger shaking is in intensity when the speed of the car is lower. I guess this is normal because the assisted direction mechanism has to put more effort into steering the wheels, with the greatest effort being put while steering the wheels and the car is stopped.

So far I didn't have go to the dealer, provided I don't quite trust them to give me a decent honest answer. As with any other successful product of capitalism, if it breaks, I'll call them to take it and repair it. I'm sure there are other people that have a better idea why is this happening.

 

It's like that with all cars I drove.

Some start making noise, some vibrate... Don't go all the way to the end, always leave a bit space...

 

yea like no limit said you should never really turn the wheel all the way, its not good for the car