Having issues implementing steep parallax mapping

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Well, it works somewhat, but it doesn't "stick out" very much. There's definitely something happening because I can clearly see the light and shadows on the correct parts of the bricks (I'm using a wall texture). The fact that changing my scale factor doesn't do anything leads me to believe something's wrong. I looked at
http://graphics.cs.brown.edu/games/SteepParallax/index.html
that website for inspiration. I thought the value in the height/bump map determines how much that part extrudes? So surely changing the scale should've changed that? Very bizarre. Anyone have any ideas...? Thanks.