<strong>15.</strong> Brake fluid is hydroscopic. In other words, it absorbs water from the atmosphere. Once this happens, the boiling point of your brake fluid drops. As little as 3 to 4 percent water content can drop the fluid boiling point by about 100 degrees. Consider flushing and changing your brake fluid periodically with fresh fluid from a sealed bottle. This becomes even more important if you live in a high-humidity climate.