[Fot] Wilwood 570 brake fluid

[Duncan Charlton]

You might see if you can find DOT 5.1.  It’s a non-silicone fluid that’s compatible with DOT 3 and DOT 4 and has a higher boiling point.

The Ford racing teams a few decades ago were seen using DOT 3 fluid when other teams were using DOT 4 fluids.  Turns out the Ford-label DOT 3 fluid required a DOT 3 designation because of its lower wet boiling point — but the dry boiling point was higher than most DOT 4 fluids of the day.  Since they expected to replace the fluid after every race, the wet boiling point didn’t matter.

How often are you replacing the Valvoline DOT 3/4 fluid?  If it’s been too long it will be “wet”, having absorbed atmospheric moisture, and this will cause it to boil at a significantly lower temperature.

Duncan

> On Feb 26, 2018, at 7:49 AM, Mike Harmuth via Fot <fot at autox.team.net> wrote:
> 
> I just replaced my brake master cylinder (Girling) and the braided lines attached to it. I've been using Valvoline DOT 3/4 fluid and it's worked out OK but at one track (Thompson), I'm always over heating the fluid. I used to use Wilwood 570 in my F440 car and thought I'd give it a try in the Spitfire since it has a higher boiling point than the Valvoline. 
> 
> My concern, probably from leaking seals in the past, was the difference between US Spec DOT 3 (Wilwood) and English DOT 3 fluids. The DOT 4 seems to be compatible, but at with lower boiling temperature than the specialty fluid.
> 
> Has any one used the Wilwood with Triumph OEM grade brake parts? 
> 
> thanks
> mike
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