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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.
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On April 16, 2020 at 8:33 AM "Reihing, Randall S." <Randall.Reihing@utoledo.edu> wrote:
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Hello All,
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Thank you Randall for this valuable and important clarification.
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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
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1959 TR3A
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<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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All brake fluid is "synthetic" whether it says so on the can or not. It's
<br> not made from petroleum distillate.
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<br> 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.
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<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.
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<br> Look for the word "silicone" on the label. DOT 5 must have it, the others
<br> cannot have it.
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<br> The word "synthetic" is totally meaningless for brake fluid.
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<br> FWIW, both of my Stags have DOT 5 in them.
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<br> -- 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?
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