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Hissing Noise from under dash

I have a 1990 TT and have a hissing noise when pressing down the clutch peddle, coming from, it would seem the clutch pedal area.  I thought it may be the clutch booster, but I have pulled the vacuum hose off in the engine bay and capped it at the manifold, but the hissing is still there.  Only does it when pressing the clutch peddle.  If I keep the clutch peddle pressed in about an inch or so it will continually hiss in that area until I push it all the way down or release it when the noise goes away.  Doing my head in trying to figure out what it could be, any ideas ?

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