It does appear that its leaking past the cover seal. And I guess when I
said the back of the master cylinder, I should have clarified that this is
an under-the-floor conversion, and I meant the side nearest the back, which
is the other end from where the plunger enters the cylinder. So there are
no seals that could be leaking or anyhting like that, it has to be the cover
gasket.
I've never seen one leak like that before, I just want to be sure I'm not
missing something stupid...
----- Original Message -----
From: "John Hugentober" <gtojohn@woh.rr.com>
To: <Old-Burb-club@yahoogroups.com>; <oletrucks@autox.team.net>
Sent: Monday, February 24, 2003 6:59 PM
Subject: Re: [Early Suburban] Brakes, again...
> From: "Steve Hanberg" <steve@oldsub.com>
> > The brake pedal on my 55.1 GMC Suburban went down about twice as far as
> normal recently, almost to the floor. One time it was fine, the next was
a
> bunch different. I pulled the transmission cover so I could get at my
> dual-master to start trouble-shooting. The small chamber was very low on
> fluid.
> >
> > I topped it off, and then had my son pump up and hold the peddle down,
> while I looked underneath for leaks. Since I make the brake lines myself,
I
> expected to discover one of my flared ends had failed. What I found was
> fuild running down the back of the master cylinder.
> >
> > This is a new (rebuilt) master cylinder just a few months ago.
Apparently
> the lid isn't fitting tight enough to keep the fuild in.
> >
> > Could something else be going on here? I've watched fuild fountain up
> when the pedal is released, but I'm surprised to have it leaking out. I'm
> thinking I need to get a new gasket, and perhaps even use two gaskets to
be
> sure its tight enough.
> >
> > But this solution seems too simple, and I'm afraid I'm missing
something.
> Anyone have any ideas?
>
> Steve,
>
> It may be a simple solution, you just need to verify that the fluid is
> really sneaking past the cover seal and is not coming out through the
piston
> in the back of the MC. Close inspection of the rear of the unit should
tell
> this. If it is just leaking out past the cover seal, you may want to
make
> sure that the clamp is pressing firmly on the lid. You might need to
remove
> the clamp and bend it to apply more pressure on the lid. Or, sometimes
> there is just dirt on the gasket or one of the sealing surfaces.
>
> John
>
>
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