Hi Bill,
You'll here good and bad stories about rebuilt master cylinders here. I did
mine (both brake and clutch) about 6 years/30,000 miles ago and it's been
good as gold. Others ended up buying a new one. The main thing to look for
seems to be pits or scratches inside the bore. If you have any, scrap it.
If not, you can probably get away with a rebuild.
MC and Slave cylinder rebuilds are fairly easy and straight forward. You
may need a bit of compressed air to (carefully) blow the piston out of the
bore.
You also need to consider rebuilding your calipers/wheel cylinders and doing
the clutch MC and slave. Remember, you're dealing with hydraulic seals that
are going on 20 years old and your life may depend on them. I learned the
semi hard way when my brake MC (slow internal leak), clutch MC (slow
external leak) and clutch slave (sudden blow out) all went within 12 months
of each other. I didn't wait for the calipers/wheel cylinders to go :-)
BTW, I now use DOT5 Silicone fluid to reduce the chance of aforementioned
pitting.
Oh, and welcome to the net.
Tom Gentry
72 TR-6 OD
Rockford, IL
TGENTR@WGC.WOODWARD.COM
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