Got to stop posting/boasting Was:rear caliper

[Konstantin Bogach]

James,
as far as I remember from my research there is no questions about
compatibility of the grease and brake fluid.  They must be sealed from
each other.  The O-ring should be compatible with brake fluid and
grease.  EPDM rubber is only one compatible with brake fluids and it is
not degrades in silicon grease.  But it does in regular or synthetic
grease.  I used it with Valvolin PowerSyntec    and now I wait when it
fails.  By the way, silicon grease gets along well with any rubber
except silicon rubber.  I was not able to find a source for EPDM O-rings
of metric sizes.  If buna-N holds well in brake fluid then it will work
with silicon grease.  The only question how does it behave in brake
fluid?

Konstantin.

james accordino wrote:

> Thanks for the tip.  I was satisfied with the service
> life, about 2 1/2 yrs. and 60k miles, but if it IS the
> o-ring that degraded, then I know I need to change to
> a different grease.  I saw you said you can get this
> lube at Napa.  You also said it's compatible with
> brake fluid, right?
>
> Thanks
> Jim Accordino
>
> --- Konstantin Bogach <kbogach at comcast.net> wrote:
> > I recommend to use silicon grease next time ( like
> > SylGlide).  It is
> > compatible with all rubbers except silicon rubber.
> > I will not degrade
> > O-ring and seal.  Plus, it is very good protection
> > from moisture.
> >
> > Konstantin.
> >
> > james accordino wrote:
> >
> > > I'm sure that's a possibility.  I'll let you know
> > when
> > > I open them up.  Probably over the Thanksgiving
> > break.
> > >  I think they might just be gunked up.  I'll look
> > at
> > > the integrity of the o-ring VERY carefully.  I'll
> > look
> > > for swelling, meltdown, whatever.  I don't think
> > the
> > > type of grease itself was the cause.
> > >
> > > Jim Accordino
> > >
> > > --- Konstantin Bogach <kbogach at comcast.net> wrote:
> > > > James,  I remember you used regular synthetic
> > gease
> > > > and buna-N O-ring of standard
> > > > size.  I wounder if this combination was a
> > recipe
> > > > for the failure?  I mean leak of
> > > > fluid to e-brake cavity.  I am looking forward
> > to
> > > > see your report on
> > > > most probable cause of the failure.
> > > >
> > > > Konstantin.
> > > >
> > > > >
> > > > >
> > > > > Thanks, Kneale.  The cables are new OEM (Ate
> > or
> > > > > Lemforder) I forget which.  I'm SURE the
> > insides
> > > > are
> > > > > humped up again.  I'll try to track what kind
> > of
> > > > > time/results I get on this rebuild.  I know I
> > > > still
> > > > > have caliper kits, pin boot kits and the lower
> > > > o-rings
> > > > > for the piston post as well as some oil seals
> > for
> > > > the
> > > > > e-brake lever shaft.
> > > > >
> > > > > Jim Accordino
> > > > >
> > > >
> > >
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