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<p>I've used silicone BF in my BJ8 for close to 30 years (and when I
replaced the brake MC, 15-20 years and 80-100K miles ago, I
disregarded the same warning). As somebody mentioned, your
problem is symptomatic of the 'check valve'--aka 'foot
valve--malfunctioning or damaged. I had similar problem with my
brakes on a long road trip; had to pump the pedal a couple times
on every application (for a couple thousand miles).<br>
</p>
<p>We put the highly-touted Castrol BF in our 100M after a thorough
restoration--with all-new brake system--and the fluid jelled when
that car sat for a couple years.</p>
<p>Side note: Most BFs are calling themselves 'synthetic' these
days. Are they a new formulation, or just jumping on the
bandwagon as, AFAIK, BF has always been synthetic (the glycols
used don't occur in nature)?<br>
</p>
<p>Bob</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 6/16/2019 7:44 AM, Team.net wrote:<br>
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cite="mid:A96D99D3-DF89-44DD-B4B4-46F783D8B8E2@gmail.com">
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<div dir="ltr">I have used silicone in all my british cars for 25
years with no problems</div>
<div dir="ltr"><br>
On Jun 16, 2019, at 09:31, HealeyRick <<a
href="mailto:healeyrik@gmail.com" moz-do-not-send="true">healeyrik@gmail.com</a>>
wrote:<br>
<br>
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<div dir="ltr">
<div dir="ltr">Apparently, silicone can cause swelling of the
seals in Girling and Lockheed systems:
<a href="http://www.gomog.com/brakes.html"
moz-do-not-send="true">http://www.gomog.com/brakes.html</a>
I have a Howe hydraulic clutch in my Nasty Boy, and that
also came with the advisory not to use silicone fluid.
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</div>
<div>Rick Neville</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sun, Jun 16, 2019 at
8:24 AM Brian Drab <<a href="mailto:bgdrab@redzone.ca"
moz-do-not-send="true">bgdrab@redzone.ca</a>> wrote:<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.</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.
</p>
<p class="MsoNormal">My question is – does anyone have
any idea what it is about.
</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.
</p>
<p class="MsoNormal">I’d appreciate any comments on
the warning.</p>
<p class="MsoNormal">Brian Drab</p>
<p class="MsoNormal">BJ8</p>
<br>
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