Do you have the right tool for this? You have to twist and push at the same time. If you've got a Harbor Freight near you, they sell an inexpensive kit that should get you going.
Personally, I open up the bleeders for this. You definitely should have the brake fluid reservoir open, too. I can't remember what the documented procedure is at the moment, but this seems to work well for me!my dad seems to think that i need to bleed some fluid to make it go in....did i miss this from the beginning?