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Thank you Terry, Dave and Joe for your kind responses. The plan has now become to convert to DOT 5 along with rebuilding the brake system. I have already installed a new clutch slave cylinder and waiting for a few more parts from Moss. Hoping they will not
be down much longer. </div>
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Randall Reihing</div>
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1959 TR3A</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> TERRY SMITH <terryrs@comcast.net><br>
<b>Sent:</b> Thursday, April 16, 2020 10:02 AM<br>
<b>To:</b> Reihing, Randall S. <Randall.Reihing@utoledo.edu>; Randall <TR3driver@ca.rr.com>; Sujit Roy <triumphstag@gmail.com>; Triumphs <triumphs@autox.team.net><br>
<b>Subject:</b> Re: [TR] [EXTERNAL] Re: Brake fluids again</font>
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Making the switch without a complete flush doesn't harm anything. With DOT 5 you will get improvements in brake/clutch line corrosion resistance, but to maximize it you might want to blow air through the drained lines to get as much of the old Dot 4 out as
possible, since it will cling to the low spots in the lines after you drain the system.
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I've run DOT 5 silicone ever since restoring my 3 in 2006. Really glad I did. </div>
<blockquote type="cite">On April 16, 2020 at 8:33 AM "Reihing, Randall S." <Randall.Reihing@utoledo.edu> wrote:
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Hello All, </div>
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Thank you Randall for this valuable and important clarification. </div>
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I am in the process of replacing just the rotors, calipers and two of the flexible brake lines to teh calipers. Can I drain out the existing DOT 4 and switch to DOT 5?
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Or do I need to completely flush the entire system and replace all the wheel cylinder, master cylinder, and clutch master and slave cylinder seals when converting from DOT 4 to DOT 5?
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Randall Reihing </div>
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1959 TR3A </div>
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<div dir="ltr" id="x_ox-739faab942-divRplyFwdMsg"><span style="font-size:11pt; color:#000000; font-family:Calibri,sans-serif"><strong>From:</strong> Triumphs <triumphs-bounces@autox.team.net> on behalf of Randall <TR3driver@ca.rr.com><br>
<strong>Sent:</strong> Thursday, April 16, 2020 1:55 AM<br>
<strong>To:</strong> 'Sujit Roy' <triumphstag@gmail.com>; 'Triumphs' <triumphs@autox.team.net><br>
<strong>Subject:</strong> [EXTERNAL] Re: [TR] Brake fluids again</span>
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<div class="x_ox-739faab942-PlainText">All brake fluid is "synthetic" whether it says so on the can or not. It's
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not made from petroleum distillate. <br>
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Yes, DOT 4 will absorb water, eat paint and so on. Castrol claims theirs <br>
absorbs slower than others (the "LMA"), but it still absorbs. <br>
<br>
DOT 5 is a completely different chemistry, a silicone oil rather than the <br>
glycols used in DOT 3, 4 and 5.1. It does not absorb water, eat paint, <br>
become corrosive over time, etc. <br>
<br>
Look for the word "silicone" on the label. DOT 5 must have it, the others <br>
cannot have it. <br>
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The word "synthetic" is totally meaningless for brake fluid. <br>
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FWIW, both of my Stags have DOT 5 in them. <br>
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-- Randall <br>
<br>
> I'm rebuild brakes and clutch with new seal on a Stag. I have <br>
> this brake fluid <br>
> <br>
> <a href="https://urldefense.com/v3/__https://www.bpnorthwest.com/fluid-brake-clutch-castrol-lma-12-__;!!LoBwcKfm!xQYsagVOFhpKFqJG0WkgFruEWat-p_lygSpuLlqbZWK-6UD6t-0Z-ZXm3e-xQY8OfVfao68$">
https://urldefense.com/v3/__https://www.bpnorthwest.com/fluid-brake-clutch-castrol-lma-12-__;!!LoBwcKfm!xQYsagVOFhpKFqJG0WkgFruEWat-p_lygSpuLlqbZWK-6UD6t-0Z-ZXm3e-xQY8OfVfao68$</a>
<br>
> oz.html <br>
> <br>
> which says DOT 4 synthetic (Castrol) . If it is synthetic, <br>
> will it absorb water? <br>
> <br>
> I'm a bit confused as people are saying get DOT5. synthetic. <br>
> Is the buzz word synthetic? <br>
<br>
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