e-brake question

[james accordino]

I think now that the most important part of keeping
brake systems fully functional for long periods of
time REQUIRES constant flushing and replacement of the
brake fluid.  I used to just shove the caliper pistons
back and fit new pads.  Maybe attend to the rotors and
the caliper sliding system.  On both Audis, the rear
calipers were filled with a thick brown goop, kind of
like apple butter where once had been brake fluid.  I
also am fairly confident that neither car ever had the
rear of the brake system bled.

Jim Accordino
--- Konstantin Bogach <kbogach at comcast.net> wrote:
> 4 years? Amazing!  I spent several days to research
> brake fluid
> compatibility with rubbers, had a trouble to find
> right rubber o-ring,
> used not totally right fit and I am not sure that it
> is compatible with
> Valvoline's  SynPower synthetic grease.  I left one
> o-ring in the grease
> and it seems to me it swells.  I love it!
> I put brakes on the car back.  After Motive bleeder
> arrive next week I
> will bleed brakes and test result. I hope it will
> let me not touch the
> calipers at leat a year.
>
> Konstantin Bogach.
>
> james accordino wrote:
>
> > The first ones I did are probably at least 3+ and
> > maybe more like 4+ yrs. old.  I don't know why
> they
> > are O.K. with the brake fluid.  Normally if some
> > rubber is NOT going to be O.K. with a solvent, I
> get
> > some indications right away.  Maybe it's because I
> > "slathered"(technical term) the  o-ring with Mobil
> 1
> > synth. grease and the brake fluid hasn't been able
> to
> > attack it?  It's amazing how much faster you get
> with
> > this after you do a few,  huh?
> >
> > Jim Accordino
> >
> > --- Konstantin Bogach <kbogach at comcast.net> wrote:
> > > Thanks. It is good to know that regular Buna-N
> or
> > > neoprene o-rings do
> > > not fail, at least fast, in this application.
> How
> > > long do you have them
> > > in calipers, by the way? I reused one ring and
> used
> > > 3/8 epdm o-ring
> > > which slightly smaller then  original. I will
> watch
> > > it and in case of
> > > leak I will replace them with 9mmIDx2mmCS
> o-rings.
> > > Now it takes me no
> > > more than 1 hour to overhaul a caliper.  Not
> that
> > > much of time.
> > >
> > > Konstantin Bogach.
> > >
> > > james accordino wrote:
> > >
> > > > I used regular black o-rings.  That's what was
> in
> > > > there.  I think they may be nitrile?  The
> powder
> > > coat
> > > > guy also said "no way the powder coat will
> work,
> > > the
> > > > brake fluid will eat it right off".  Yeah, he
> > > knows
> > > > his product.  Maybe it's because I keep my
> brake
> > > fluid
> > > > inside the calipers.  I don't know if the
> o-ring
> > > is
> > > > swollen or whatever, and I don't feel like
> > > > disassembling a fully functional caliper to
> see.
> > > If
> > > > it was wasted, the brake fluid will come out
> the
> > > cam
> > > > seal.  Absolutely, no doubt.  When or if I
> ever
> > > see
> > > > brake fluid there, or they stop functioning,
> or I
> > > lose
> > > > my mind I'll inspect them.
> > > >
> > > > Jim Accordino
> > > >
> > > > --- Konstantin Bogach <kbogach at comcast.net>
> wrote:
> > > > > James,
> > > > >
> > > > > did you change that small o-ring on threaded
> rod
> > > > > which seals e-brake
> > > > > cavity? What size did you use?  I found that
> the
> > > > > only rubber compatible
> > > > > with brake fluid is EPDM (ethylen propylen).
>  I
> > > can
> > > > > not find metric
> > > > > sizes of EPDM o-rings. Closest standard size
> is
> > > > > ID3/8'' W1/16'', but it
> > > > > is thinner.  By the way, because there is
> the
> > > > > grease on other side the
> > > > > o-ring this grease should be campatible with
> > > EPDM as
> > > > > well. Full
> > > > > synthetic without ester and petroleum oil
> > > additives
> > > > > should work.
> > > > > Can you comment on this?
> > > > >
> > > > > Konstantin Bogach.
> > > > > P.S. First c-clip took about 4h, second one
> -
> > > 5min.
> > > > > Impresive progress!
> > > > >
> > > >
> > > >
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