Subject: Leaky Master Cylinder Questions?

[C1J1Miller@aol.com]

Chad wrote:
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Resently my master cylinder on my 86 4kcs Q has began leaking break fluid. It
just started and only leaked a little bit and has just been getting worse.  I
keep putting off fixing it because I have no experience in this area...yet.
But as this car is teaching my how to fix just about everything on it.  I was
wondering for those of you who are familiar with these problems, do I have to
replace the whole master cylinder or can I just replace the
gasket?  I really cannot tell just by looking at it where it is leaking from.
I tried cleaning it but it was still hard to tell.  If I do need a new master
cylinder, how much is a rebuilt/good used one run. I can see small puddles
below the master cylinder after the car has been sitting for awhile.
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Chad: don't let it leak long; brakes = your life; also, the fluid eats paint.
One typical leak point is from the brake proportioning valve beneath the
master cylinder; easily replaced (get aftermarket from German Parts and
Restoration or the like).  Try drying off the area with a rag and Simple
Green, then looking carefully later for any drips.
If it's the master cylinder, common wisdom is to replace it.  After either
repair, fully flush and bleed the brakes.
HTH  Chris Miller, Windham NH, c1j1miller@aol.com