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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