There is a stretch of pretty worn road by me, and the path of where your tyres go is probably an inch or so sunk below the rest of the road, like ingrained tracks.
When braking the car pulls all over the place, to the left and right. I recently had new discs and pads all round but this hasn't made a difference.
I was in a mates brand new A4 the other day and told him about it so he drove over it and braked, and said that he had the same thing. Now, I wasn't driving so I don't know how badly it pulled compared to mine but it made me even more confused as to why this happens as his car was only 3 days old compared to my 2000 S3.