Hello. Auto A4 B6, the problem concerns such a single tap as if from the front left wheel when starting (usually when you turn the steering wheel to the left) and when I brake a single quite loud knock to listen. In addition, at the beginning I thought that it was a tire ... namely, not always, but still often hear such a knock knock knock as if something in the tire was sitting but the tire falls off is good. The rubbers on the rocker arms look nice, so rather, the rocker arms are ok. Anyone know what it can be?