Every 3 to 6 Months (5,000 to 8,000 km)
Depending on the fluid types your vehicle uses, getting your brake fluid, coolant, and windshield washer fluid checked and filled every three to six months, or three to four times a year, is wise. Some last longer than others, while specialty fluids have their own timing that can differ. Other checks that should be done while getting your fluids checked include oil changes (again, depending on the type of oil you use), as well as getting your tires inspected for wear and tear.