if you get vibration all the time it is either an unbalanced tire or alignment problems. Sometimes certain alignment problems can cause the steering wheel to shake a bit, but more likely it's an unbalanced tire as it is easy to throw a wheel weight.

If it occurs ONLY under braking, then your rotors are warped.

"Tutto fa brodo."

Todd Scungio
98 RS
15.173 @ 90.70 MPH

And also a 2011 Ralliart