2 weeks ago i got 2 new tyres in front and 2 nearly new tyres back. Since then my car feels bumpy. I brought the car 2 times to the tire guy and he always adjusted the tires new but still the same. The strange thing is, after driving 20 minutes, the problem is gone and it happens most of time when driving 100 km/ (60 m/ph). Is it possible that my DSC is broken or do i really have to put 4 new tires on ????
Thank in advance for your support.
Greeting from Switzerland