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</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='mso-fareast-language:EN-US'>I made myself some notes which I later submitted to our local AH mag. Here’s the gist of them. May have posted this before….<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><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=MsoNoSpacing><span style='font-family:"Times New Roman",serif'><o:p> </o:p></span></p><p class=MsoNoSpacing><span style='font-family:"Times New Roman",serif'>The word “synthetic” began to appear when manufacturers worked out that it made regular brake fluid sound more special ie they could charge us more money for the same old stuff.<o:p></o:p></span></p><p class=MsoNoSpacing><span style='font-family:"Times New Roman",serif'><o:p> </o:p></span></p><p class=MsoNoSpacing><span style='font-family:"Times New Roman",serif'>DOT stands for <b><u>D</u></b>ept. <b><u>O</u></b>f <b><u>T</u></b>ransport and relates to the fluids’ boiling points. If a car brakes at high speed, the brakes get hot. Some heat is carried away from the brakes by the brake fluid. Bad news if the fluid boils! The faster you’re going, the higher DOT you need. Higher DOT numbers indicate higher boiling points for “Dry” fluid (has not absorbed any water) and “Wet” fluids (has absorbed water). ie, the wetter it is, the more problematic it becomes. Mixing 3 with 4 lowers the boiling points and vice verca.”<o:p></o:p></span></p><p class=MsoNoSpacing><span style='font-family:"Times New Roman",serif'><o:p> </o:p></span></p><p class=MsoNoSpacing><span style='font-family:"Times New Roman",serif'>Simon<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='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>From:</span></b><span lang=EN-US> Healeys <healeys-bounces@autox.team.net> <b>On Behalf Of </b>Mark Donaldson<br><b>Sent:</b> 31 October 2022 22:06<br><b>To:</b> 'Bob Spidell' <bspidell@comcast.net>; healeys@autox.team.net<br><b>Subject:</b> Re: [Healeys] Brake Fluid<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-NZ style='font-family:"Tahoma",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>DOT5 and DOT 5.1 are <b>NOT</b> compatible.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-NZ style='font-family:"Tahoma",sans-serif;color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-NZ style='font-family:"Tahoma",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>I’ve have been using Bel-Ray DOT5 SBF in my BN2 and my tri-carb since 1992.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-NZ style='font-family:"Tahoma",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>I’ve never had a problem.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-NZ style='font-family:"Tahoma",sans-serif;color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-NZ style='font-family:"Tahoma",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>Mark<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-NZ style='font-family:"Tahoma",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>Ardmore, NZ<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-NZ style='color:#1F497D;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>From:</span></b><span lang=EN-US> Bob Spidell <<a href="mailto:bspidell@comcast.net">bspidell@comcast.net</a>> <br><b>Sent:</b> Monday, 31 October 2022 5:35 PM<br><b>To:</b> <a href="mailto:healeys@autox.team.net">healeys@autox.team.net</a><br><b>Subject:</b> Re: [Healeys] Brake Fluid<o:p></o:p></span></p></div></div><p class=MsoNormal><span lang=EN-NZ><o:p> </o:p></span></p><p class=MsoNormal style='margin-bottom:12.0pt'><span lang=EN-NZ>"... There is a newer Glycol Ester DOT5 ..."<br><br>I think you're referring to 'DoT5.1' I also think it was deliberately named so as to confuse the issue.<o:p></o:p></span></p><div><p class=MsoNormal><span lang=EN-NZ>On 10/30/2022 8:05 PM, Christopher Moog via Healeys wrote:<o:p></o:p></span></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoNormal style='margin-bottom:12.0pt'><span lang=EN-NZ>I've used both. Currently prefer DOT4.<br><br>Also everyone is speaking of DOT5 but there are now two different DOT5s. The first is the older silicone based DOT5. There is a newer Glycol Ester DOT5 that is compatible with DOT3 and DOT4. It has a lower viscosity than the DOT3 and DOT4 so it works better in some ABS systems. It also has a higher boiling point than DOT3 and DOT4. Don't see an advantage in Healeys.<o:p></o:p></span></p><div><p class=MsoNormal><span lang=EN-NZ>On 10/30/2022 10:00 PM, Alan Seigrist wrote:<o:p></o:p></span></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><p class=MsoNormal style='margin-bottom:12.0pt'><span lang=EN-NZ>The best selling point for Dot 4 is you can mix any Dot 4 or even Dot 3 if you need to fill up. As I understand it with Dot 5 you should be careful to always use the same brand to fill up if necessary.<br><br>Also, neither Dot 5 not Dot 4 is great for sitting a long time, Dot 4 absorbs water, Dot 5 will push any water down into the components.<br><br>Dot 4, if the car is not used regularly, needs to be flushed every couple of years.<o:p></o:p></span></p></div><p class=MsoNormal><span lang=EN-NZ><o:p> </o:p></span></p><div><div><p class=MsoNormal><span lang=EN-NZ>On Mon, Oct 31, 2022 at 5:43 AM Michael MacLean <<a href="mailto:springer.mike51@gmail.com">springer.mike51@gmail.com</a>> wrote:<o:p></o:p></span></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt'><div><div><p class=MsoNormal><span lang=EN-NZ>At this point in the restoration I have a completely rebuilt brake system with all new components and tubing. Now is the time to make the decision to use DOT 4 or Silicone. What's the consensus, if there is one?<o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-NZ>Mike MacLean<o:p></o:p></span></p></div></div><p class=MsoNormal><span lang=EN-NZ><o:p> </o:p></span></p></blockquote></div></blockquote></blockquote><p class=MsoNormal><span lang=EN-NZ><o:p> </o:p></span></p></div></body></html>