I was having a brake dragging problem. I adjusted the rod leading to the master cylinder, and it got better. I could no longer hear it dragging while driving. I put the car in the air and spun a wheel. Still drags a little. On all four wheels. I tried adjusting the rod all the way one way and all the way the other while my brother spun wheels. Couldn't get it to go away. Ideas?

Why do you think the problem is in the brake pedal? Sounds more like a warped brake rotor or a caliper/pad issue.