Recently I had a problem with my brakes. It seemed that I had no power in my brake pedal. I took it to a VW dealership and they found a crack in the vaccuum hose coming from the brake boost. They replaced it and the problenm was resolved. I also got the dealership to change my timing belt. NOW I HAVE A PROBLEM. When accelerating (in every gear) at about 2000 RPM's a blowing sound is heard coming from the engine. I took the car back to the dealership and the mechnic went for a ride with me. He said that it was normal (only a pressure relese valve in the turbo unit)!!! I have never heard this sound before - in any diesel I have owned. Anyone have any idea what this might be?