The first time I boiled the fluid at Brünnchen I assumed I had a leak. The pedal went long, then hard, then long again over the next two corners, and I limped back to the paddock convinced something had failed.

Nothing had failed. The fluid had simply reached a temperature at which the water it had absorbed over eighteen months turned to vapour, and vapour compresses in a way that brake fluid does not.

Racing fluid does not fix this on its own. A high dry boiling point is only relevant when the fluid is dry, and glycol-based fluid starts drawing moisture out of the air the moment you open the bottle.

The fix is unglamorous: flush annually whether it looks dirty or not, keep the bottle sealed, and bleed after every second track day. Since I started doing that, the pedal has stayed where I left it.

It cost me a set of pads and a genuine fright to learn something the manual states plainly on page 140.