I just replaced one that had an internal leak "past the piston cup" and the
fluid would squirt up like your talking about. The reason I know it was an
internal leak was that sometimes the pedal would be right up their like
normal and other times I would have to pump the pedal slightly to have the
same stopping power. I also pressed the pedal several times and then held
the pedal down and after about a minute the pedal moved every so slightly
toward the floor. I replaced the master cylinder, bleed the brakes and it's
like new again.
Joe
----- Original Message -----
From: "Steve Hanberg" <Steve@OldSub.com>
To: <Old-Burb-club@yahoogroups.com>; <oletrucks@autox.team.net>
Sent: Monday, February 24, 2003 7:57 PM
Subject: [oletrucks] Re: [Early Suburban] Brakes, again...
> 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
> >
> >
> > Link to Group Page at Yahoo Groups
> > http://groups.yahoo.com/group/Old-Burb-club/
> >
> > To Unsubscribe send a BLANK e-mail to:
> > Old-Burb-club-unsubscribe@egroups.com
> >
> > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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