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Certainly sounds like boiled fluid.

The question really is when was your brake fluid last changed? The key is to change it every 6 months or less and that will solve your problems for most situations, and only if you're spending extended driving periods on the track do you need to go to a different fluid.

For me in a 30 minute session with standard fluid I have no issues, and that's high speed (130 mph) with hard braking , but I do run with the PSM off most of the time to help ease up on the brakes.
 

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thanx guys for the input.
4by4, yes, it happend pitside after 30min session.
will tell porsche centre to put in higher temp fluid.
You might not get your dealer to put anything but the standard fluid in. But as I said for a 30 minute session the standard fluid should be fine as long as it is changed frequently....but the same applies for high temp fluid as well, because it is water in the fluid that normally causes the issue.
 

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mikeventer, when did you last replace your fluid though?

In all of this that is the single most important thing and may avoid all of your problems, as brake fluid is hydroscopic and so absorbs water (moisture in the air) and over time becomes saturated, and is worse in humid climates. With water in the fluid the boiling point is lowered significantly.

Once you've replaced the fluid follow what 4by4 says as a cool down on the last laps and if you are confident to drive with PSM off then do it, as that dramatically reduces brake heat.

When I come to rest in the pits I don't apply the handbrake to make sure there is no heat soak (although if present would be minimal) from the discs to the pads/pistons/fluid.
 
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