e-brake question

[Konstantin Bogach]

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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