When I brake at my Omi B 2.5td I feel a restlessness on the steering wheel.But this is only from about 80 km/h when I easily climb onto the brake pedal.Have now changed the brake discs 2 times.In the beginning everything was OK and after 1000 km it started again.According to the brake test stand a brake disc always has a blow. With winter tyres 195/65/15 it is less than with the summer tyres VO.225/45/17 HI: 255/40/17