You can also temperature shock the bleeder screws. Get yourself quite a bit of water, and get a torch. Heat the sucker up and while it's still hot dump some water on it. That's what we did to my friend's F-150 bleeder screws. Works great. Just be careful you don't catch stuff on fire. It's probably best to take the wheel off. Also take note of what Dan Robertson said, be careful not to overheat it and mess up the rubber seals in the cylinder.