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@Ndeipi
It's water that doesn't go above 100 degrees until it's steam (or pressurised). It sits at 100 while the water molecules take it in turn to fly away. This is latent heat of evaporation.
Mineral oil in Shimano/Magura disc brakes boils at 310 degrees, so it'll all heat up steadily to 310 deg before it plateaus and starts boiling. But I'm guessing some part of the brake system will probably fail before it gets to 310 degrees and would spew hot oil all over you, as if you were attempting to invade a medieval castle.