A brake fluid replacement is a brake bleeding procedure. An appliance known as a brake bleeder introduces fresh brake fluid—under pressure—to the brake fluid reservoir.
When performing a brake fluid replacement, brake bleeder screws are placed at each brake caliper. The brake bleeder screws are manually opened to allow fresh fluid to flow through in the following order: left rear, right rear, right front, left front. The screws are opened in the following order: left rear, right rear, right front, left front until all four are filled with fresh brake fluid. They remain open until all four are filled with fresh brake fluid. Not only does it fill the reservoir with fresh fluid, but it also displaces any trapped air.
*Avoid contact between the brake fluid and the surface of the vehicle. It will damage the paint.
While most manufacturers recommend that a brake fluid replacement be performed every three years, you would be best advised to follow the factory recommended vehicle maintenance schedule for how frequently to replace the brake fluid. This factory recommendation must be adhered by to maintain the validity of your new car warranty and extended auto warranty, if applied. If mechanical breakdown occurs due to the lack of your car's maintenance of the brake fluid, the warranty would not cover the car repair.