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Agree. Usually, the recommended solvent is denatured alcohol
(ethanol spiked with chemicals to make it undrinkable--well, you <i>could
</i>drink it, but you wouldn't be a happy camper). I used it to
flush my Austin-Healey 3000's system decades ago and silicone has
been in ever since with no issues (that I could attribute to the DoT
5).<br>
<br>
<br>
<div class="moz-cite-prefix">On 5/16/2020 8:16 AM, Karl Vacek via
Shop-talk wrote:<br>
</div>
<blockquote type="cite"
cite="mid:1721e0edcb0.28bf.cd27845553c78383775132770b7455be@gmail.com">Yes,
unfortunately you do.
<br>
<br>
Every silicone conversion failure I've ever heard of (I even
cheated on this process once and had a failure of my own) has
involved contamination with conventional fluid. Flush all hard
lines with lacquer thinner or similar, all new rubber and hoses,
only lubricate the rubber with silicone fluid.
<br>
<br>
I'd be sure to soak the rubber you've already installed in some
sort of solvent and even then say a prayer that the DOT 3 didn't
get too far into the rubber. Conventional fluid is alcohol based,
so alcohol might be there way to soak the contaminated rubber,
then dry well - like a day or more, maybe in warm conditions.
<br>
<br>
Seems that DOT 3 or 4 gets way into the rubber and eventually
reacts once it's in silicone fluid. And then people blame the
silicone fluid for eating their rubber parts and hoses.
<br>
<br>
Karl
<br>
<br>
On May 16, 2020 9:14:23 AM Robert Nogueirao via Shop-talk
<a class="moz-txt-link-rfc2396E" href="mailto:shop-talk@autox.team.net"><shop-talk@autox.team.net></a> wrote:
<br>
<br>
<blockquote type="cite">I’m helping a friend rebuild her brake
system. All new lines and hoses. I’ve rebuilt the calipers,
brake cylinders and master cylinder and they are ready to
install.
<br>
Here’s the problem:
<br>
In rebuilding the cylinders I coated the bores lightly with red
brake grease and DOT 3
<br>
Fluid. Now she tells me she may want to go with Silicone
fluid. Does that mean I need to disassemble and wash out all
the cylinders and calipers?
<br>
Thanks for any answers.
<br>
<br>
Bob Nogueira
<br>
</blockquote>
<br>
</blockquote>
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