Brake Fluid is a hydroscopic fluid, this means it absorbs moisture. The brake fluid is pumped into brake lines, hoses, abs pumps, calipers and wheel cylinders to stop our vehicles. When it is brutally cold outside, we still expect our vehicle to stop when called upon and then release the brakes when pedal is released.
So What? Well as the brake fluid is hydroscopic this means it starts to absorb moisture naturally. Because of this, the brake fluids boiling point lowers. This can lead to brake fade and internal system corrosion. Corrosion leads to possible leaks. If the leak goes unnoticed, it will lead to brake system failure, which is a most dangerous situation. Corrosion in system can cause Master cylinders, calipers, wheel cylinders, proportioning valves, hoses, abs valving and seals to bind tear or leak. The importance of having the system flushed is to remove moisture, and help stop and minimize the creation of corrosion.