What happens when brake fluid absorbs moisture?

Brake fluid has hygroscopic properties - meaning that it absorbs moisture during its life in your car through the pipes, hoses and joints that it lubricates. As the water content in the brake fluid increases, the temperature the liquid boils at decreases.

Subsequently, one may also ask, what is meant by wet boiling point of brake fluid?

The Dry Boiling Point of brake fluid refers to the boiling temperature of fresh, new brake fluid from an unopened container. Whereas the Wet Boiling Point is defined as the temperature DOT brake fluid will begin to boil after it has absorbed 3.7% water by volume.

How often do you need to change brake fluid?

Some manufacturers include it in their maintenance schedules and others don't. Mercedes-Benz, for example, says brake fluid should be flushed and replaced with new fluid every two years or 20,000 miles. Volkswagen says that a brake fluid flush should be done on most of its models every two years regardless of mileage.

Why does brake fluid absorb water?

Glycol-ether (DOT 3, 4, and 5.1) brake fluids are hygroscopic (water absorbing), which means they absorb moisture from the atmosphere under normal humidity levels.

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