[TR] [EXTERNAL] Re: Brake fluids again

[TERRY SMITH]

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 at 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 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$ 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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