Brake fluid is like a sponge, it attracts and absorbs water. Unlike oil and water brake fluid and water do mix and wet brake fluid causes corrosion inside brake calipers, wheel cylinders, master cylinders, and ABS pumps. Corrosion inside these parts leads to fluid leaks and non functioning parts and yes this does cause expensive failures but, by flushing the old wet fluid from the system and replacing it with new fluid you’ll extend the life of these costly parts. Never allow brake fluid to remain in your car for more than two years
