To bleed brake lines, park the car in a flat spot and engage the emergency brake so that you can drain and replace the brake fluid from the master cylinder reservoir. Then, go to your right rear wheel and loosen the bleeder screw. Let the fluid drain until it runs clear. Then, have someone press the brakes to the floorboard while you close the bleeder screw. Repeat this process three times, making sure you don’t run out of brake fluid. For advice from our Mechanic reviewer about how to test your brakes, scroll down!