Brake fluids for sport and racing purposes are specially developed for vehicles that are subjected to extreme braking, for example, on race tracks. Their key characteristic is a significantly higher boiling point compared to standard fluids. During intense braking, high temperatures are generated, which are transferred to the brake fluid. If the temperature exceeds its boiling point, vapor begins to form in the fluid. Because vapor is compressible, this manifests as a sinking brake pedal and a loss of braking effect, which is referred to as "vapor lock." Racing fluids prevent this phenomenon. Two main parameters are distinguished: the "dry boiling point," which applies to new fluid from an unopened package, and the "wet boiling point," which indicates the boiling temperature after a certain period during which the fluid has absorbed atmospheric moisture. Brake fluids are hygroscopic, meaning they absorb water, and this lowers their boiling point. These special fluids often absorb moisture more quickly, and therefore require more frequent replacement to maintain their properties.