Leaking hydraulic fluid

[Ms. B]

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Help! My quattro is leaking hydraulic fluid what appears to be from the res=
ervoir itself.  From the cap!!  When the car starts and the system pressuri=
zes and I move the steering, it starts to bubble out of the cap like it's o=
ver pressurized.  I don't see fluid leaking anywhere else other than there =
but it's bad enough that it empties the reservoir in about 15 minutes under=
 pressure.  Do I have a pressure valve that's not functioning anymore?  The=
 car stood for about a year without anyone driving it.