In article <1116316727.085769.311140@g47g2000cwa.googlegroups .com>,
mmdir2002@yahoo.co.uk says...
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> I took my 89 Civic car to two mech. They told me my car is leaking
>from m/c. They told me to replace right away. I talked about brake
>line leaking. They jacked it up and showed me my brake line are all
>fine. He said just change the m/c. My simply thought is m/c is so
>small I'm thinking I can changed by myself. I believe
>the leak is between m/c and power boost. is there a seal or
>gasket place bewteen m/c and power boost. all I can do is just
>unscrew two bolts holding a m/c from power boost. do you think
>I just replace the seal or gasket rather than replace the whole
>master cylinder?

No. The fluid is leaking out of the MC into the booster. You need to
keep the fluid in the MC, not just keep it from leaking out of the booster
after it leaks out of the MC. It is a good idea to get this done ASAP
since your braking system is an important safety feature.
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Alex