Before going to the trouble of swapping out the booster, try the "spare" booster.
  Put a "T" in a vaccuum line, and attatch it to the booster, outside of the vehicle, unmounted. Then, with vaccuum applied, actuate it. If your spare hisses, it is probably a normal thing. If it doesn't, you need to swap.

  There is a port near the center of the booster that is supposed to be kept clear, to allow air movement in the normal pressure section of the booster. If that port has become blocked or restricted, the noise may result. Find the foam filter in the center of the booster, near the master cylinder. It should be clean and dry. (Right! Like that is going to be the case after 20-some years...)

Jonce Fancher <streetbugs@whispllc.com> wrote:
          Hi all
Got a Little Hissing noise when you step on the brake. You can sit there and idle and press on the brake NO Noise. Press a little harder and Noise starts. stays
constant during the harder pressing but will drop off when you let off the brake pedal. would it be the Booster? and with the leak would it change engine
performance and or running of the engine I.E. rich condition or rough Idle??

I have a spare booster as a spare everything else. anyone have the amount of time it would take to swap it out and a test to do to make sure it is the Booster?

Thanks All
Jonce

Jonce Fancher

56 Single Cab
66 Sunroof Bug
66 Variant Squareback
66 Porsche 912
71 Sunroof Bus
84 Vanagon "Gottfried"
85 Vanagon Westi
2003 10 Passenger Sprinter

Fancher's Upholstery Inc. - www.fanchers.com
Not-A-VW Club- http://mywebpages.comcast.net/jaransont3/notavwclub/

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