It is OK to mix water with some types of brake fluid. This statement is __________.

Mixing water with brake fluid is not advisable because it can significantly compromise the performance and safety of a vehicle's braking system. Brake fluids, particularly those classified as DOT 3, DOT 4, and DOT 5.1, are designed to have specific properties, including a defined boiling point and viscosity, which can be severely affected by the introduction of water. When water is mixed with brake fluid, it lowers the overall boiling point, increasing the chances of the brake fluid boiling during high-stress conditions such as hard braking, particularly in situations where heat build-up occurs.

Additionally, introducing water into the brake system can lead to corrosion of the internal components and degrade the fluid over time, leading to decreased braking efficiency and potential failure. Therefore, handling brake fluid correctly and keeping it free from contamination, including water, is crucial for maintaining a reliable braking system.