e-brake question

[james accordino]

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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