My jag is 03 s-type and droven in MN which means really really cold weather. anyway, recently while driving car, I could hear some sort of noise and shaking in the same time(I felt like something was moving underneath the car), when the car reached 30~40miles. I wonder if this is just normal problem during the winter, or it is time to replace some parts about brake or wheel. anywon know about this issue, plz let me know and thx !!

 

With very little to go on it is a guess at best. My first question would be, does it go away after the car warms up or you have driven for a while? If you are only going on short trips it could just be cold tires. Low profile tires tend to shake for a bit when they are cold. It takes mine a few miles on the highway to smooth out. Also, check in the rim for accumulated ice or snow. That too can cause wheel vibration since it acts like wheel weights and throws the wheel balance off.

 

First things first - check your tire pressures. This is especially important for folks who live in cold winter climates. If you haven't checked them lately, your tires could be seriously underinflated with the onset of winter, or you could find a nail in a tire as well....