I'm beginning to think I'd better buy a NEW master cylinder...
----- Original Message -----
From: "Joe Garcia" <joegarcia1@comcast.net>
To: <oletrucks@autox.team.net>
Sent: Monday, February 24, 2003 8:00 PM
Subject: Re: [oletrucks] Re: [Early Suburban] Brakes, again...
> 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
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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