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<p class="MsoNormal">You can’t switch from DOT3/4 to DOT 5 without replacing _<i>all</i>_ 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.</p>
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<p class="MsoNormal" style="border:none;padding:0in"><b>From: </b><a href="mailto:forzion7@gmail.com">David Friedlander</a><br>
<b>Sent: </b>Saturday, September 9, 2017 9:13 AM<br>
<b>To: </b><a href="mailto:TR3driver@ca.rr.com">Randall</a><br>
<b>Cc: </b><a href="mailto:triumphs@autox.team.net">TR3 Triumphs</a>; <a href="mailto:anncarletta@yahoo.com">
Ann Carletta</a><br>
<b>Subject: </b>Re: [TR] Brake Fluid for TR3A</p>
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<p class="MsoNormal"><span style="font-family:"Comic Sans MS";color:#000099">Randall;<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Comic Sans MS";color:#000099">I am installing new brake master cylinders in my TR3 and the boxes <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Comic Sans MS";color:#000099">theycame in had the label you can see in the attached photo. <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Comic Sans MS";color:#000099">What do you make of this?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Comic Sans MS";color:#000099">I run DOT5 in my TR6 without issue but am rebuilding this <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Comic Sans MS";color:#000099">TR3 and wanted to use DOT5 here as well...<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Comic Sans MS";color:#000099">Thanks,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Comic Sans MS";color:#000099">Dave Friedlander<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Comic Sans MS";color:#000099">Maine<o:p></o:p></span></p>
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<p class="MsoNormal">On Sat, Sep 9, 2017 at 2:35 AM, Randall <<a href="mailto:TR3driver@ca.rr.com" target="_blank">TR3driver@ca.rr.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">There is no clear consensus on brake fluid. Some of us love DOT 5 silicone,<br>
others hate it.<br>
<br>
But I do recommend that you find out what you have before topping up; and<br>
also look for where it is leaking. Since this is a single circuit braking<br>
system, it only takes one leak to rob you of all hydraulic brakes. Not a<br>
good feeling, especially when you're going downhill into an underground<br>
parking garage, and the handbrake is also broken!<br>
<br>
Also, if you don't have DOT 5, any other brake fluid will eat paint promptly<br>
and promote rust. And any of them will ruin the rear brake shoes if it gets<br>
on them.<br>
<br>
If you do use one of the non-silicone formulas, you also shouldn't keep an<br>
old can of it. They suck moisture directly from the air, once the can has<br>
been opened, and start getting old. That's why you should always open a new<br>
can; and change it in your braking system every few years, even if you don't<br>
drive the car. (Just one of the many reasons I like DOT 5, it doesn't suck<br>
<g>)<br>
<br>
Here is a good article (IMO) on the pros & cons of DOT 5<br>
<a href="http://www.buckeyetriumphs.org/technical/Brakes/Fluid/Fluid.htm" target="_blank">http://www.buckeyetriumphs.org/technical/Brakes/Fluid/Fluid.htm</a><br>
If you are a glutton for punishment, you can also find the SAE papers that<br>
it references here<br>
<a href="https://drive.google.com/open?id=0B2H2NJt34OffdnhWS19scjlNUU0" target="_blank">https://drive.google.com/open?id=0B2H2NJt34OffdnhWS19scjlNUU0</a><br>
<br>
Of all the TR3s I've driven and owned, only my current "barn find" 56 needed<br>
lead (substitute). I eventually changed the head, and now I don't use lead.<br>
My previous TR3A engine went well over 100,000 miles without ever having<br>
lead added.<br>
<span style="color:#888888"><br>
<span class="hoenzb">-- Randall</span></span><o:p></o:p></p>
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