E55 KEV

Last Friday I was doing some very spirited driving on normal roads in the E55. Some fast accels, high speeds and heavy braking. Just having some fun. I was no where near track driving or racing conditions. All of a sudden while I was coming to a red light stop the car cuts off and I get a dash warning message saying something about "Brack Fluid: and then it flashes something like "Visit Work Shop".

The car did start back up. It was late, so I checked Brake Fluid level next day and it was well above minimum. Probably halfway between minimum and maximum. Could I have over heated the brake oil? Oil still looks clear in color. I have driven the car normally for 6 day and no indication of brake problem since Friday. Anyone else?