How do you get brake fluid to come out of master cylinder when bleeding brakes?

If you replaced only the brake pads there is no need to open the lines but since you did try this. Make sure the fluid level is full in the reservoir and put a small clear plastic tube on all the zerks and then put the tubes into a clean small clean empty water bottle with about an inch of clean brake fluid in it. After you crack the zerks you slowly push the pedal until all the air is removed and then close the zerks and remove the tubes and job done. If you bled the reservoir dry then you can purchase a bleeder kit from the parts house for a few dollars and there are instruction in the boxed kit explaining the procedure, really easy.