Got mine from van-cafe for around $100.  Install is a snap.  Just make sure you bleed and re-bleed the brakes.

http://www.vanagonauts.com/Brake-master-cyclinder190.htm

Chris S.
----- Original Message ----
From: William Landsman <unclebeer@HOTMAIL.COM>
To: vanagon@GERRY.VANAGON.COM
Sent: Friday, January 4, 2008 1:07:07 PM
Subject: Master Cylinder

Hello Vanagon List and Happy New Year,

I have a bad Master Cylinder and am looking at replacing I with this
 part
from gowesty.  Anyone have experience with this part/manufacturer, or
 would
you recommend another.

Part #251-611-021C

List Price: $357.30
Our Price: $99.95

Weight: 4.00 lbs

Works with vehicle years:
1980 - 1991

New Master Cylinder for all Vanagon. Made in Germany. List price
 $357.30

Regards,

Wm L.

1990 Westy

      ____________________________________________________________________________________
Be a better friend, newshound, and
know-it-all with Yahoo! Mobile.  Try it now.  http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ