brakes don't grab

Is there a way to make the brakes grab better?

When normally stopping I have to push the pedal more than half way down and when I have to stop in a hurry because some genius decides to cut in front of me and slam on his brakes (this happens too often living in Orlando) I have to stand on the pedal. The brakes just don't feel like they grab at all. When stopped at a light I have to keep the pedal almost as far down as it will go to keep the truck still.

I changed the pads last weekend, I've driven about 150 miles this week. The pedal doesn't feel any softer than with the old pads (would like for it to be firmer but I know that's just how frontiers are), fluid is good-When I put the new pads on it brought the level up to the max line without adding any fluid. I used OEM pads.

Does anyone have any suggestions? have I just not driven enough for them to break in?