e-brake question

[Konstantin Bogach]

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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