When the brake fluid starts boiling, it's too late. Braking gives rise to high brake fluid temperatures. In extreme cases the fluid begins to boil and causes vapor or gas bubbles to form in the brake system. This vapor or gas can be compressed allowing the brake pedal to be pressed all the way to the floor but the vehicles braking system is not functioning properly. ATE Racing Brake Fluid has excellent properties to handle the rigors of the racetrack, they also have the famous blue brake fluid, which allows you to visually see when you have completely flushed your brake system.