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<div>I have used Castrol LMA in all my British cars for over 40 years. This year I rebuilt the complete brake system on my Bugeye I went to the local supplier of Brit car parts to buy another bottle of Castrol LMA BF. Even though she had it on the shelf the owner of the store told me to buy the Lockheed brand because Castrol BF is no longer made by the same people. It is not the same stuff and I would be far better off with Lockheed Dot 4 BF. She offered no explanation further other than the new Castrol LMA was crap and the Lockheed stuff can be trusted. I tend to listen to someone that sells the stuff every day. My BN2 is a completely new system with an original master that has been re-sleeved. I guess I could start out with silicone fluid, but all my experience is with Dot 3/4. I have managed to use it for 40 years and not removed too much paint in the process.<br></div><div>Mike MacLean<br></div><div><br></div>
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On Sunday, June 16, 2019, 9:50:43 AM PDT, Kees Oudesluijs <coudesluijs@chello.nl> wrote:
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<p>Entirely correct.</p>
<p>DOT4 will be perfect for most users. DOT5 for the silicone boys.
DOT5.1 is similar to DOT4 but is upgraded to more or less the same
properties (e.g. boiling point) as DOT5 but absorbs water and is
compatible in practically all classic car braking components. It
is better suited to extreme driving compared to DOT4. It may also
have a harder pedal as it is non-compressable. DOT5 is slightly
compressible and can feel a bit spongy when you are not used to
it. Most won´t notice anything.<br clear="none">
</p>
<p>ALL brake fluids should be replaced on a regular bases, usually
every 2 years, in very damp environments more often. <br clear="none">
</p>
<p>Kees Oudesluijs</p>
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<div class="yiv8707325154moz-cite-prefix">Op 16-6-2019 om 18:15 schreef
<a rel="nofollow" shape="rect" class="yiv8707325154moz-txt-link-abbreviated" ymailto="mailto:simon.lachlan@alexarevel.plus.com" target="_blank" href="mailto:simon.lachlan@alexarevel.plus.com">simon.lachlan@alexarevel.plus.com</a>:<br clear="none">
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<p class="yiv8707325154MsoNormal"><span style="color:windowtext;">When
this came round last time, I did a little digging and came
up with this, which I believe I may have inflicted on you
before. It was written for our local (UK) club magazine but
I’m sure that most of it, if not all, is universal. It’s
more about what mixes with which rather than which rots
what. If you get my meaning….</span></p>
<ol style="margin-top:0cm;list-style-position: inside;list-style-position: inside" start="1" type="1"><li class="yiv8707325154MsoNoSpacing" style=""><span style="">All
brake fluid is “synthetic”…it’s not a “natural” product.</span></li><li class="yiv8707325154MsoNoSpacing" style=""><span style="">Most
synthetic fluids are NOT silicone. They are <span style="color:#222222;">polyethylene <u>glycol</u> ether
based.</span></span></li><li class="yiv8707325154MsoNoSpacing" style=""><span style="">DOT
3 & 4, which can be mixed, are not silicone. They are
glycol.</span></li><li class="yiv8707325154MsoNoSpacing" style=""><span style="">DOT
5, which cannot be mixed with 3 or 4, is silicone. Can’t
be mixed with anything!</span></li><li class="yiv8707325154MsoNoSpacing" style=""><span style="">DOT
5.1 is glycol based and cannot be mixed with DOT 5.</span></li><li class="yiv8707325154MsoNoSpacing" style=""><span style="">DOT
5.1 can be mixed with DOT 3 or 4, as both are glycol
based.</span></li></ol>
<p class="yiv8707325154MsoNormal"><span style="color:windowtext;">Simon</span></p>
<p class="yiv8707325154MsoNormal"><span style="color:windowtext;"> </span></p>
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<p class="yiv8707325154MsoNormal"><b><span style="color:windowtext;" lang="EN-US">From:</span></b><span style="color:windowtext;" lang="EN-US"> Healeys
<a rel="nofollow" shape="rect" class="yiv8707325154moz-txt-link-rfc2396E" ymailto="mailto:healeys-bounces@autox.team.net" target="_blank" href="mailto:healeys-bounces@autox.team.net"><healeys-bounces@autox.team.net></a> <b>On Behalf Of
</b>Bob Spidell<br clear="none">
<b>Sent:</b> 16 June 2019 16:34<br clear="none">
<b>To:</b> <a rel="nofollow" shape="rect" class="yiv8707325154moz-txt-link-abbreviated" ymailto="mailto:healeys@autox.team.net" target="_blank" href="mailto:healeys@autox.team.net">healeys@autox.team.net</a><br clear="none">
<b>Subject:</b> Re: [Healeys] silicone brake fluid</span></p>
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<p class="yiv8707325154MsoNormal"> </p>
<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).</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)?</p>
<p>Bob</p>
<p> </p>
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<p class="yiv8707325154MsoNormal">On 6/16/2019 7:44 AM, Team.net wrote:</p>
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<p class="yiv8707325154MsoNormal">I have used silicone in all my british
cars for 25 years with no problems</p>
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<p class="yiv8707325154MsoNormal" style="margin-bottom:12.0pt;"><br clear="none">
On Jun 16, 2019, at 09:31, HealeyRick <<a rel="nofollow" shape="rect" ymailto="mailto:healeyrik@gmail.com" target="_blank" href="mailto:healeyrik@gmail.com">healeyrik@gmail.com</a>>
wrote:</p>
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<p class="yiv8707325154MsoNormal">Apparently, silicone can cause
swelling of the seals in Girling and Lockheed
systems: <a rel="nofollow" shape="rect" target="_blank" href="http://www.gomog.com/brakes.html">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. </p>
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<p class="yiv8707325154MsoNormal"> </p>
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<div>
<p class="yiv8707325154MsoNormal">Rick Neville</p>
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<p class="yiv8707325154MsoNormal"> </p>
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<p class="yiv8707325154MsoNormal">On Sun, Jun 16, 2019 at 8:24 AM
Brian Drab <<a rel="nofollow" shape="rect" ymailto="mailto:bgdrab@redzone.ca" target="_blank" href="mailto:bgdrab@redzone.ca">bgdrab@redzone.ca</a>>
wrote:</p>
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<p class="yiv8707325154MsoNormal" style=""><span lang="EN-CA">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.</span></p>
<p class="yiv8707325154MsoNormal" style=""><span lang="EN-CA">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. </span></p>
<p class="yiv8707325154MsoNormal" style=""><span lang="EN-CA">My question is – does anyone have
any idea what it is about. </span></p>
<p class="yiv8707325154MsoNormal" style=""><span lang="EN-CA">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. </span></p>
<p class="yiv8707325154MsoNormal" style=""><span lang="EN-CA">I’d appreciate any comments on
the warning.</span></p>
<p class="yiv8707325154MsoNormal" style=""><span lang="EN-CA">Brian Drab</span></p>
<p class="yiv8707325154MsoNormal" style=""><span lang="EN-CA">BJ8</span></p>
<p class="yiv8707325154MsoNormal"><span lang="EN-CA"> </span></p>
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