Hey Mark,
Thanks for the info!
Perhaps all those failures are with original parts still in them?
Robert D.
-----Original Message-----
From IfixMGs at aol.com <IfixMGs@aol.com>
To: RobertDuquette@sympatico.ca <RobertDuquette@sympatico.ca>
Date: March 16, 2000 7:52 AM
Subject: Brake Soup....
> The black goop in the the brake system is falls into two
ategories -
>solvented rubber as you thought, and some is generated (distilled,
actually)
>from the reaction between water, heat, acidified brake fluid and rubber
>'goop' under pressure. The rubber deteriorates a molecule at a time, at the
>jagged (microscopically speaking) wiping edge. Electrostatically, the
rubber
>in solution acts like oil floating on water, binding with itself, and the
>tidal action of the master cylinder tends to keep it in one place, moving
>back and forth. DOT3 fluid is another villain. Don;t use it for anything.
The
>days of natural rubber seals are gone, but DOT3 sucks up moisture like a
>sponge......
> I did a study on contaminants in an industrial hydraulic system, and
>found that 5 micron filtration systems had half again the failure rate of 4
>micron filters, indicating that the most damaging detrius was between 4 and
>just under 5 microns. Adding a system which shunted some of the fluid thru
a
>pump/3 micron filter with every operation of the system allowed a cyclic
>scrubbing that eventually stopped contaminant failure altogether.
> I bet the same holds true for automotive systems - especially ABS with
>easily fouled valves, but Spridgets, too..... But I also think there is
>something in the inherent design of the system that makes them fault-prone.
>There are a lot of 20 year old Nissans, Toyotas, Fords and Chevys running
>around that have NEVER had the brake reservoir topped off, and they pass
>inspection, and the brakes actually work well..... In the early days of
>English Rubber and US DOT2.5 and 3 brake fluids gumming up the works,
>failures were expected.With todays neoprene and DOT4 fluid, the fails
should
>be nearly non-existent, but judging by the threads from several LBC BBs,
they
>are rather prevalent... I always thought that the fragile 'skirt' style
seal
>was the culprit. I've been toying with the idea of using Jap slave cyl
>pistons and conventional cups in resized & sleeved Lockheed cylinders. The
>only marketing problem is prohibitive product liability.
> Mark Childers
>
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