IT sure sounds like a vacuum leak. First the system creates a sucking noise that can be a described as a hiss or whistle most often.
Second, I believe the brakes are boosted by engine vacuum on that, so you are losing brake assist and having the brake loss.
Thirdly, the code does state vacuum.
Have someone else start the car while you listen for the area it is coming from. Keep doing this til you locate it.
IF you are having trouble isolating it, I can help with diagrams possibly. But you need to narrow it down as close as possible and post pics if needbe.
Tuesday, August 25th, 2009 AT 8:08 PM