Who has experienced this after about ten minutes of first, second, third gear type acceleration and hard braking in tight turns?

Brakes did still work - but the brake force was only applied after a lot of travel in the brake paddle.

The amount of heat the PCCBs generate should not bring the brake fluid to an elevated temperature. Is another type of fluid needed?

 

From experience .. it is possible to boil the fluid on PCCB. I would suggest replacing the OEM fluid Castrol SRF.

 

As a small correction, mishref means that you should replace your OEM Porsche brake fluids with the Castrol SRF which I have done. It's super expensive but well worth it since it has a higher boiling point.

 

There was discussion either here or on Rennlist about 3 months ago re the PCCB pedal travel after the brakes reach proper operating temps: Some stated that this is normal with PCCB, and that this will also facilitate proper heel-toeing, as the brake pedal now more in line with the accelerator.....

 

There are 2 issues that are going on (not sure which one you are experiencing)
- new ceramic pads when finally heated for the first time experience a green fad / gas release that causes the that sinking pedal feeling / car doesn't stop for 20 seconds and then it is gone
- new ceramic rotors have a very high engagement point until the rotors get some aging and then the bite point falls about 1 inch and stays that way

Finally, while it is possible that you boiled the fluid, i doubt it after a few hard stops.

If the engagement point is now lower, congrats, your $10,000 brakes are now worked in - they will be easy to modulate and h/t if you so wish

If it is the pads, congrats it will not happen again until you get new pads.

If it is the fluid you should be able to determine this by doing 10 stops 80mph to zero and if you peal is really bad then it will be pretty obvious

Motul RBF 600 or 660 is much cheaper than the Castrol brand mentioned and has held up for my last 20 trackdays without a change.


Finally, check to see the thickness of you rear pads just incase they are totally gone and the sensor has not triggered the brake pad light - a really thin pads "could" be the cause of boiled fluid

Paul