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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-GB link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:windowtext;mso-fareast-language:EN-US'>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….<o:p></o:p></span></p><ol style='margin-top:0cm' start=1 type=1><li class=MsoNoSpacing style='mso-list:l0 level1 lfo1'><span style='font-family:"Times New Roman",serif'>All brake fluid is “synthetic”…it’s not a “natural” product.<o:p></o:p></span></li><li class=MsoNoSpacing style='mso-list:l0 level1 lfo1'><span style='font-family:"Times New Roman",serif'>Most synthetic fluids are NOT silicone. They are <span style='color:#222222'>polyethylene <u>glycol</u> ether based.</span><o:p></o:p></span></li><li class=MsoNoSpacing style='mso-list:l0 level1 lfo1'><span style='font-family:"Times New Roman",serif'>DOT 3 & 4, which can be mixed, are not silicone. They are glycol.<o:p></o:p></span></li><li class=MsoNoSpacing style='mso-list:l0 level1 lfo1'><span style='font-family:"Times New Roman",serif'>DOT 5, which cannot be mixed with 3 or 4, is silicone. Can’t be mixed with anything!<o:p></o:p></span></li><li class=MsoNoSpacing style='mso-list:l0 level1 lfo1'><span style='font-family:"Times New Roman",serif'>DOT 5.1 is glycol based and cannot be mixed with DOT 5.<o:p></o:p></span></li><li class=MsoNoSpacing style='mso-list:l0 level1 lfo1'><span style='font-family:"Times New Roman",serif'>DOT 5.1 can be mixed with DOT 3 or 4, as both are glycol based.<o:p></o:p></span></li></ol><p class=MsoNormal><span style='color:windowtext;mso-fareast-language:EN-US'>Simon<o:p></o:p></span></p><p class=MsoNormal><span style='color:windowtext;mso-fareast-language:EN-US'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='color:windowtext'>From:</span></b><span lang=EN-US style='color:windowtext'> Healeys <healeys-bounces@autox.team.net> <b>On Behalf Of </b>Bob Spidell<br><b>Sent:</b> 16 June 2019 16:34<br><b>To:</b> healeys@autox.team.net<br><b>Subject:</b> Re: [Healeys] silicone brake fluid<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></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).<o:p></o:p></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.<o:p></o:p></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)?<o:p></o:p></p><p>Bob<o:p></o:p></p><p><o:p> </o:p></p><div><p class=MsoNormal>On 6/16/2019 7:44 AM, Team.net wrote:<o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><p class=MsoNormal>I have used silicone in all my british cars for 25 years with no problems<o:p></o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'><br>On Jun 16, 2019, at 09:31, HealeyRick <<a href="mailto:healeyrik@gmail.com">healeyrik@gmail.com</a>> wrote:<o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><div><p class=MsoNormal>Apparently, silicone can cause swelling of the seals in Girling and Lockheed systems: <a 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. <o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Rick Neville<o:p></o:p></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>On Sun, Jun 16, 2019 at 8:24 AM Brian Drab <<a href="mailto:bgdrab@redzone.ca">bgdrab@redzone.ca</a>> wrote:<o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm'><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><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.<o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><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. <o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-CA>My question is – does anyone have any idea what it is about. <o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><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. <o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-CA>I’d appreciate any comments on the warning.<o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-CA>Brian Drab<o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-CA>BJ8<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-CA><o:p> </o:p></span></p></div></div></blockquote></div></div></blockquote><pre><o:p> </o:p></pre></blockquote></div></body></html>