No gasket that I know of. You obviously have a leak there though so take it apart and see where its coming from.
Heres a bunch of diagrams and stuff that will help you along the way. Dont wait till you have no brake fluid left please
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ZC stuff
http://dh-racing.com
http://www.thezcr.com/html/zcbook.php
http://dmoore.com/crx/zc.htm
http://www.jgenginedynamics.com/HOME%20PAGE
http://www.theoldone.com/
