[TR] Brake Fluid for TR3A

[Paul Tegler]

Just like many of the replacement cyl boxes state.... warranty voided if 
you use silicone fluid (Dot 5)

What it boils down to is 5 does not lubricate the rubber seals the way 
3/4 does. It's also a crap shoot

as it effects synthetic vs natural rubber seals differently

I too have been running 5 in all my LBC's for years. Yes, I've replaced 
a master or two, but no more than when I was running 3

Paul Tegler ptegler at verizon.net www.teglerizer.com
On 9/9/2017 7:12 PM, dave wrote:
>
> I think that’s a good idea, but I don’t really think its true
>
> *From:* Triumphs [mailto:triumphs-bounces at autox.team.net] *On Behalf 
> Of *Cliff Hansen
> *Sent:* Saturday, September 9, 2017 12:04 PM
> *To:* David Friedlander <forzion7 at gmail.com>; Randall 
> <TR3driver at ca.rr.com>
> *Cc:* TR3 Triumphs <triumphs at autox.team.net>; Ann Carletta 
> <anncarletta at yahoo.com>
> *Subject:* Re: [TR] Brake Fluid for TR3A
>
> You can’t switch from DOT3/4 to DOT 5 without replacing _/all/_ of the 
> non-metal parts: caliper seals, hoses, master cylinder seals, and 
> thoroughly cleaning the metal parts.  I’m guessing that they used DOT3 
> brake fluid as a lubricant when they assembled the master cylinder.
>
> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for 
> Windows 10
>
> *From: *David Friedlander <mailto:forzion7 at gmail.com>
> *Sent: *Saturday, September 9, 2017 9:13 AM
> *To: *Randall <mailto:TR3driver at ca.rr.com>
> *Cc: *TR3 Triumphs <mailto:triumphs at autox.team.net>; Ann Carletta 
> <mailto:anncarletta at yahoo.com>
> *Subject: *Re: [TR] Brake Fluid for TR3A
>
> Randall;
>
> I am installing new brake master cylinders in my TR3 and the boxes
>
> theycame in had the label you can see in the attached photo.
>
> What do you make of this?
>
> I run DOT5 in my TR6 without issue but am rebuilding this
>
> TR3 and wanted to use DOT5 here as well...
>
> Thanks,
>
> Dave Friedlander
>
> Maine
>
> On Sat, Sep 9, 2017 at 2:35 AM, Randall <TR3driver at ca.rr.com 
> <mailto:TR3driver at ca.rr.com>> wrote:
>
>     There is no clear consensus on brake fluid.  Some of us love DOT 5
>     silicone,
>     others hate it.
>
>     But I do recommend that you find out what you have before topping
>     up; and
>     also look for where it is leaking.  Since this is a single circuit
>     braking
>     system, it only takes one leak to rob you of all hydraulic
>     brakes.  Not a
>     good feeling, especially when you're going downhill into an
>     underground
>     parking garage, and the handbrake is also broken!
>
>     Also, if you don't have DOT 5, any other brake fluid will eat
>     paint promptly
>     and promote rust.  And any of them will ruin the rear brake shoes
>     if it gets
>     on them.
>
>     If you do use one of the non-silicone formulas, you also shouldn't
>     keep an
>     old can of it.  They suck moisture directly from the air, once the
>     can has
>     been opened, and start getting old.  That's why you should always
>     open a new
>     can; and change it in your braking system every few years, even if
>     you don't
>     drive the car.  (Just one of the many reasons I like DOT 5, it
>     doesn't suck
>     <g>)
>
>     Here is a good article (IMO) on the pros & cons of DOT 5
>     http://www.buckeyetriumphs.org/technical/Brakes/Fluid/Fluid.htm
>     If you are a glutton for punishment, you can also find the SAE
>     papers that
>     it references here
>     https://drive.google.com/open?id=0B2H2NJt34OffdnhWS19scjlNUU0
>
>     Of all the TR3s I've driven and owned, only my current "barn find"
>     56 needed
>     lead (substitute).  I eventually changed the head, and now I don't
>     use lead.
>     My previous TR3A engine went well over 100,000 miles without ever
>     having
>     lead added.
>
>     -- Randall
>
>
>
>
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