Disconnect the brake outlet lines from the brake master cylinder and cap the lines.
Install short brake hoses with ends submerged in the brake master cylinder reservoir.
Fill the brake master cylinder reservoir with High Performance DOT 3 Brake Fluid C6AZ-19542-AB or equivalent meeting Ford specification ESA-M6C25-A, DOT 3.
Have an assistant pump the brake pedal until clear, bubble-free brake fluid flows from both brake hoses.
Remove the short brake hoses and install the brake outlet lines.