Alan,
Oh, you want to talk seriously!!! I think I might be able to muster a
few seconds of serious consideration. (maybe)
The Modern sealed reservoirs typically have a diaphragm under the cover
that either expands or collapses to the conditions of pressure and
vacuum that is experienced with temperature changes.
I have found that if the reservoir becomes low the diaphragm will even
collapse into the tank. It must therefore be returned to its normal
shape when the tank is refilled.
I also noticed that the fluid (or fluif if you prefer) in my Blazer
turned a nice shade of rusty brown after about 100,000 miles and I
flushed the system and put in fresh fluid. After almost 200,000 miles
it still has had no brake hydraulic trouble. Just gotta love those
"Chebbies"
Joe
Alan Myers wrote:
>
> All foolin' aside, I think you'll find all brake fluid reservoirs have
> some form of venting. If they didn't, the rising and dropping levels of
> fluid (or fluif, as it is better known on the list) would form either
> mild compression or vacuum inside the reservoir, one of which could
> possibly cause a shoe or pad to drag, the other could draw air into the
> system through any "weak point". The levels have to rise and drop as you
> apply the brakes, as the shoes and pads wear, and as temperatures vary.
> But, hey, I ain't no engineer!
>
> Alan Myers
> San Jose, Calif.
> '62 TR4 CT17602L
>
> Joe Curry wrote:
> >
> > Brian Borgstede wrote:
> > >
> > > Since the topic has been drug up to the surface again,
> > > from the pit of threads that never die...
> > >
> > > If DOT 3&4 brake fluids take on water as they do,
> > > Why are the master cylanders on our LBCs vented to the outside air?
> >
> > Oh, That one's easy! The vent is so that when the fluid gets hot it
> > will expand and leak out the hole and onto your freshly painted engine
> > compartment. This of course will cause the paint to bubble up and come
> > off in sheets!
> >
> > Perhaps there was an agreement between the Auto paint manufacturers and
> > Girling like the one that apparently exists between the windscreen
> > suppliers and the people who deliver crushed rock in the State of
> > Washington (and perhaps elsewhere). 8^)
> >
> > Joe
> >
> > --
> > "If you can't excel with talent, triumph with effort."
> > -- Dave Weinbaum in National Enquirer
>
> --
> MZ
--
"If you can't excel with talent, triumph with effort."
-- Dave Weinbaum in National Enquirer
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