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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 f=
lexible 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 whee=
l cylinder, master cylinder, and clutch master and slave cylinder seals whe=
n converting from DOT 4 to DOT 5?
Randall Reihing
1959 TR3A
________________________________
From: Triumphs <triumphs-bounces@autox.team.net> on behalf of Randall <TR3d=
river@ca.rr.com>
Sent: Thursday, April 16, 2020 1:55 AM
To: 'Sujit Roy' <triumphstag@gmail.com>; 'Triumphs' <triumphs@autox.team.ne=
t>
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-clutc=
h-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 **
wcKfm!xQYsagVOFhpKFqJG0WkgFruEWat-p_lygSpuLlqbZWK-6UD6t-0Z-ZXm3e-xQY8OEaR3r=
ck$
Archive: https://urldefense.com/v3/__http://www.team.net/pipermail/triumphs=
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Hello All,</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
Thank you Randall for this valuable and important clarification. </div=
>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
I am in the process of replacing just the rotors, calipers and two of the f=
lexible brake lines to teh calipers. Can I drain out the existing DOT 4 and=
switch to DOT 5? </div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
Or do I need to completely flush the entire system and replace all the whee=
l cylinder, master cylinder, and clutch master and slave cylinder seals whe=
n converting from DOT 4 to DOT 5? </div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
Randall Reihing</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
1959 TR3A</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div id=3D"appendonsend"></div>
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<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" st=
yle=3D"font-size:11pt" color=3D"#000000"><b>From:</b> Triumphs <triumphs=
-bounces@autox.team.net> on behalf of Randall <TR3driver@ca.rr.com>=
;<br>
<b>Sent:</b> Thursday, April 16, 2020 1:55 AM<br>
<b>To:</b> 'Sujit Roy' <triumphstag@gmail.com>; 'Triumphs' <triump=
hs@autox.team.net><br>
<b>Subject:</b> [EXTERNAL] Re: [TR] Brake fluids again</font>
<div> </div>
</div>
<div class=3D"BodyFragment"><font size=3D"2"><span style=3D"font-size:11pt;=
">
<div class=3D"PlainText">All brake fluid is "synthetic" whether i=
t 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 the=
irs<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<b=
r>
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=3D"https://urldefense.com/v3/__https://www.bpnorthwest.com/flu=
id-brake-clutch-castrol-lma-12-__;!!LoBwcKfm!xQYsagVOFhpKFqJG0WkgFruEWat-p_=
lygSpuLlqbZWK-6UD6t-0Z-ZXm3e-xQY8OfVfao68$">
https://urldefense.com/v3/__https://www.bpnorthwest.com/fluid-brake-clutch-=
castrol-lma-12-__;!!LoBwcKfm!xQYsagVOFhpKFqJG0WkgFruEWat-p_lygSpuLlqbZWK-6U=
D6t-0Z-ZXm3e-xQY8OfVfao68$</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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tml__;!!LoBwcKfm!xQYsagVOFhpKFqJG0WkgFruEWat-p_lygSpuLlqbZWK-6UD6t-0Z-ZXm3e=
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