[TR] Brake Fluid for TR3A

[dave]

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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