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Just to keep the thread alive, I use DOT 4 in all 8 of our family cars and 3 motorcycles and do all the brake work on them (fluid, rotors, pads, calipers, drums, brake lines etc), including the 2 race cars (which use high heat versions) and the BN7.
<div>I also have a small ball point pen size moisture meter to test the fluid and it works well. I know Silicon DOT5 needs to be used on totally new systems. Friends that used it in new systems love it. But I know mixing it with another DOT 3 or 4 can cause
jelling if it gets contaminated. So I only keep DOT 4 on my shelf.<br>
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<div dir="ltr">Regards,
<div>Richard C</div>
<div>BN7 440</div>
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<blockquote type="cite">On Oct 31, 2022, at 20:32, WILLIAM B LAWRENCE <ynotink@msn.com> wrote:<br>
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Bob, I’d say more of a problem on all of the hundreds because the front bleeder screws are on the lower slave cylinders.</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Healeys <healeys-bounces@autox.team.net> on behalf of Mark Donaldson <ardmorebusiness@xtra.co.nz><br>
<b>Sent:</b> Monday, October 31, 2022 10:06 PM<br>
<b>To:</b> 'Bob Spidell' <bspidell@comcast.net>; healeys@autox.team.net <healeys@autox.team.net><br>
<b>Subject:</b> Re: [Healeys] Brake Fluid</font>
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<p class="x_MsoNormal"><span style="font-family:"Tahoma",sans-serif; color:#1F497D">DOT5 and DOT 5.1 are
<b>NOT</b> compatible.</span></p>
<p class="x_MsoNormal"><span style="font-family:"Tahoma",sans-serif; color:#1F497D"> </span></p>
<p class="x_MsoNormal"><span style="font-family:"Tahoma",sans-serif; color:#1F497D">I’ve have been using Bel-Ray DOT5 SBF in my BN2 and my tri-carb since 1992.</span></p>
<p class="x_MsoNormal"><span style="font-family:"Tahoma",sans-serif; color:#1F497D">I’ve never had a problem.</span></p>
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<p class="x_MsoNormal"><span style="font-family:"Tahoma",sans-serif; color:#1F497D">Mark</span></p>
<p class="x_MsoNormal"><span style="font-family:"Tahoma",sans-serif; color:#1F497D">Ardmore, NZ</span></p>
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<p class="x_MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Bob Spidell <bspidell@comcast.net>
<br>
<b>Sent:</b> Monday, 31 October 2022 5:35 PM<br>
<b>To:</b> healeys@autox.team.net<br>
<b>Subject:</b> Re: [Healeys] Brake Fluid</span></p>
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<p class="x_MsoNormal" style="margin-bottom:12.0pt">"... There is a newer Glycol Ester DOT5 ..."<br>
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I think you're referring to 'DoT5.1' I also think it was deliberately named so as to confuse the issue.<br>
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<p class="x_MsoNormal">On 10/30/2022 8:05 PM, Christopher Moog via Healeys wrote:</p>
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<p class="x_MsoNormal" style="margin-bottom:12.0pt">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.<br>
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<p class="x_MsoNormal">On 10/30/2022 10:00 PM, Alan Seigrist wrote:</p>
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<p class="x_MsoNormal" style="margin-bottom:12.0pt">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>
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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>
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Dot 4, if the car is not used regularly, needs to be flushed every couple of years.<br>
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<p class="x_MsoNormal">On Mon, Oct 31, 2022 at 5:43 AM Michael MacLean <<a href="mailto:springer.mike51@gmail.com">springer.mike51@gmail.com</a>> wrote:</p>
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<p class="x_MsoNormal">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?</p>
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<p class="x_MsoNormal">Mike MacLean</p>
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