The wet boiling point is the temperature at which brake fluid, which already contains a certain amount of water, begins to boil. Glycol-based brake fluids are so-called "hygroscopic", which means they absorb atmospheric moisture over time. The presence of water in the fluid lowers its boiling point. This parameter therefore indicates the boiling point of the fluid after simulated aging, when it has absorbed approximately 3.7% of water. The wet boiling point value better reflects the real condition of the brake fluid after prolonged use in a vehicle, unlike the "dry boiling point", which measures the boiling temperature of a completely new fluid without water content. If the fluid temperature exceeds this point during intensive braking, the resulting gas bubbles can lead to a reduction in braking effect.