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<p>The main problem with Silicon fluid/DOT 5 is that it hardly
absorbs water, so when water enters the sytem (due to
condensation) it will sink to the lowest point and causes
corrosion and havoc. On it own not a big problem if you renew the
fluid every 2 years or so, as you also would do with DOT 4, but
most people using DOT 5 never replace the fluid.</p>
<p>Some manufacturers do not recommend DOT 5 hence the warning
“Using Silicon Brake fluid will void warranty”.<br>
</p>
<p>Perhaps the grease they use in the factory at assembly is not
compatible with DOT 5.</p>
<p>Perhaps some rubber items are not suitable for DOT 5, however my
understandig is theat DOT is OK with new rubber parts as long as
you first clean them using alcohol/meth. spirits and dry them
thoroughly. <br>
</p>
<p>Once the rubber parts have been exposed to DOT 4 you should not
use them with DOT 5 or vise versa. Some people do at their own
peril. <br>
</p>
<p>Kees Oudesluijs</p>
<p><br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">Op 15-6-2019 om 17:14 schreef Brian
Drab:<br>
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<p class="MsoNormal">Last week I completed a driving tour in our
BJ8. It was a great tour and everything ran well except for
one thing. 4 or 5 times, when I used the clutch, the clutch
master cylinder bypassed. The rest of the time it worked well.
As I don’t want to be caught without a clutch at a later date
I am changing the clutch master cylinder. I have received a
replacement and am preparing to install it.<o:p></o:p></p>
<p class="MsoNormal">On the box is a quick summary of the
bleeding procedure under a warning – “Using Silicon Brake
fluid will void warranty”. I have used silicon fluid for well
over 10 tears and never experienced any problems with it and
have never seen or heard of this type of warning before. I
have never heard of any destructive qualities of Silicon
fluid.
<o:p></o:p></p>
<p class="MsoNormal">My question is – does anyone have any idea
what it is about.
<o:p></o:p></p>
<p class="MsoNormal">For me to change to Dot4 fluid is quite a
big deal as I would be changing out the clutch as well as the
brake system seeing as they share a common reservoir.
<o:p></o:p></p>
<p class="MsoNormal">I’d appreciate any comments on the warning.<o:p></o:p></p>
<p class="MsoNormal">Brian Drab<o:p></o:p></p>
<p class="MsoNormal">BJ8<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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