[TR] Brake Fluid for TR3A

[david brady]

I'm switching over to DOT5. I removed all my hydraulics and sent them 
off to White Post in Va for rebuilding. Fifteen years ago WP over-size 
bored and pressed brass inserts into all my hydraulics. I'm afraid I've 
neglected the system in the meantime. My clutch master cylinder started 
leaking and it bubbled up the surrounding paint. The DOT4 fluid turned 
gelatinous and developed a precipitate. WP is probably assembling the 
cylinders using DOT4 but I don't care. When I receive the items they're 
going back in with DOT5. I'll let you know how it turns out.


David Brady, TR250, CD8124L <done with dot3/4>


On 09/10/2017 09:25 AM, Paul Tegler wrote:
>
> 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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