[TR] [EXTERNAL] Re: Brake fluids again

Reihing, Randall S. Randall.Reihing at utoledo.edu
Thu Apr 16 06:33:32 MDT 2020


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 at autox.team.net> on behalf of Randall <TR3driver at ca.rr.com>
Sent: Thursday, April 16, 2020 1:55 AM
To: 'Sujit Roy' <triumphstag at gmail.com>; 'Triumphs' <triumphs at 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$
> 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?

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