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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.
I've run DOT 5 silicone ever since restoring my 3 in 2006. Really glad I did.
> On April 16, 2020 at 8:33 AM "Reihing, Randall S."
> <Randall.Reihing@utoledo.edu> wrote:
>
> Hello All,
>
> Thank you Randall for this valuable and important clarification.
>
> 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?
>
> 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?
>
> Randall Reihing
> 1959 TR3A
>
>
>
> ---------------------------------------------
> From: Triumphs <triumphs-bounces@autox.team.net> on behalf of Randall
> <TR3driver@ca.rr.com>
> Sent: Thursday, April 16, 2020 1:55 AM
> To: 'Sujit Roy' <triumphstag@gmail.com>; 'Triumphs'
> <triumphs@autox.team.net>
> Subject: [EXTERNAL] Re: [TR] Brake fluids again
>
> All brake fluid is "synthetic" whether it says so on the can or not. It's
> not made from petroleum distillate.
>
> Yes, DOT 4 will absorb water, eat paint and so on. Castrol claims theirs
> absorbs slower than others (the "LMA"), but it still absorbs.
>
> DOT 5 is a completely different chemistry, a silicone oil rather than the
> glycols used in DOT 3, 4 and 5.1. It does not absorb water, eat paint,
> become corrosive over time, etc.
>
> Look for the word "silicone" on the label. DOT 5 must have it, the others
> cannot have it.
>
> The word "synthetic" is totally meaningless for brake fluid.
>
> FWIW, both of my Stags have DOT 5 in them.
>
> -- Randall
>
> > I'm rebuild brakes and clutch with new seal on a Stag. I have
> > this brake fluid
> >
> >
> 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$
> > oz.html
> >
> > which says DOT 4 synthetic (Castrol) . If it is synthetic,
> > will it absorb water?
> >
> > I'm a bit confused as people are saying get DOT5. synthetic.
> > Is the buzz word synthetic?
>
> ** triumphs@autox.team.net **
>
> Donate:
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<head>
<meta charset="UTF-8">
</head>
<body>
<div style="font-size: 12pt; font-family: helvetica, arial, sans-serif;
color: rgb(51, 51, 51);">
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.
</div>
<div style="font-size: 12pt; font-family: helvetica, arial, sans-serif;
color: rgb(51, 51, 51);">
<br>
</div>
<div style="font-size: 12pt; font-family: helvetica, arial, sans-serif;
color: rgb(51, 51, 51);">
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:
<br>
<br>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size:
12pt; color: #000000;">
Hello All,
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size:
12pt; color: #000000;">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size:
12pt; color: #000000;">
Thank you Randall for this valuable and important clarification.
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size:
12pt; color: #000000;">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size:
12pt; color: #000000;">
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?
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size:
12pt; color: #000000;">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size:
12pt; color: #000000;">
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?
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size:
12pt; color: #000000;">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size:
12pt; color: #000000;">
Randall Reihing
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size:
12pt; color: #000000;">
1959 TR3A
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size:
12pt; color: #000000;">
<br>
</div>
<br>
<hr style="display: inline-block; width: 98%;">
<div dir="ltr" id="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>
<div>
</div>
</div>
<div class="ox-739faab942-BodyFragment">
<div class="ox-739faab942-PlainText">
All brake fluid is "synthetic" whether it says so on the can or not.
It's
<br> not made from petroleum distillate.
<br>
<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.
<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>
<br> The word "synthetic" is totally meaningless for brake fluid.
<br>
<br> FWIW, both of my Stags have DOT 5 in them.
<br>
<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?
<br>
<br> ** triumphs@autox.team.net **
<br>
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