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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).
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.
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)?
Bob
On 6/16/2019 7:44 AM, Team.net wrote:
> I have used silicone in all my british cars for 25 years with no problems
>
> On Jun 16, 2019, at 09:31, HealeyRick <healeyrik@gmail.com
>
>> Apparently, silicone can cause swelling of the seals in Girling and
>> Lockheed systems: http://www.gomog.com/brakes.html I have a Howe
>> hydraulic clutch in my Nasty Boy, and that also came with the
>> advisory not to use silicone fluid.
>>
>> Rick Neville
>>
>> On Sun, Jun 16, 2019 at 8:24 AM Brian Drab <bgdrab@redzone.ca
>>
>> Last week I completed a driving tour in our BJ8. It was a great
>> tour and everything ran well except for one thing. Â 4 or 5 times,
>> when I used the clutch, the clutch master cylinder bypassed. The
>> rest of the time it worked well. As I donâ??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.
>>
>> On the box is a quick summary of the bleeding procedure under a
>> warning â?? â??Using Silicon Brake fluid will void warrantyâ??. 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.
>>
>> My question is â?? does anyone have any idea what it is about.
>>
>> 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.
>>
>> Iâ??d appreciate any comments on the warning.
>>
>> Brian Drab
>>
>> BJ8
>>
>>
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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>
</div>
<blockquote type="cite"
cite="mid:A96D99D3-DF89-44DD-B4B4-46F783D8B8E2@gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<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>
</div>
<blockquote type="cite">
<div dir="ltr">
<div dir="ltr">Apparently, silicone can cause swelling of the
seals in Girling and Lockheed systems:Â Â
<a href="http://www.gomog.com/brakes.html";
moz-do-not-send="true">http://www.gomog.com/brakes.html</a>Â
I have a Howe hydraulic clutch in my Nasty Boy, and that
also came with the advisory not to use silicone fluid. Â
<div><br>
</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>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div lang="EN-CA">
<div class="gmail-m_8066255316544746563WordSection1">
<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. Â 4 or 5 times, when I
used the clutch, the clutch master cylinder
bypassed. The rest of the time it worked well. As I
donâ??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 â?? â??Using
Silicon Brake fluid will void warrantyâ??. 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 â?? 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">Iâ??d appreciate any comments on
the warning.</p>
<p class="MsoNormal">Brian Drab</p>
<p class="MsoNormal">BJ8</p>
<br>
</div>
</div>
</blockquote>
</div>
</div>
</blockquote>
<pre class="moz-quote-pre" wrap="">
</pre>
</blockquote>
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