mmdir2002@yahoo.co.uk wrote in
news:1116316727.085769.311140@g47g2000cwa.googlegr oups.com:

>
> 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.



Sure can. But make sure you get that new pushrod adjusted correctly. It you
don't, the brakes will not work properly, and may even lock on as you
drive.

It can also be difficult to bleed all the air out of the new master
cylinder without bench-bleeding it, so you'd get a spongy pedal.

And you have to get all the hydraulic connections undone without stripping
the nuts, which can be a _lot_ harder than it sounds, even with the correct
type of wrench.




> 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?



There is an almost 100% chance at this point that the seals INSIDE the
master cylinder are bad, and those likely due to corrosion in the bore.

The sort of questions you're asking are those of someone who does not
really understand his braking system. Uness you want to spend a week or so
fussing with this to get everything right, I'd suggest serious Googling,
library reading, or just pay the mechanics for their knowledge and
experience.


--
TeGGeR®

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/