Toon shader: 0.0 smoothness is still smooth - How to use it?

Greetings,
I wish to create some toon shader to get a minimalistic 2D look with barely some shading. My problem is that the shadow (or what is it) is too smooth even if I set smooth to 0. How to get this right?
Thanks in advance.
http://i1268.photobucket.com/albums/jj563/agiro8747/carIssue_zpsuhcsq8i1.jpg

EDIT: I found a decent, though not toon shader solution online. here is the link:

Credit to: blender stackexchange

I have had some very nice results in the past with the help of this tutorial. Here is the link: http://www.minimaexpresion.es/?p=1070&lang=en

Thanks for the help, I will bookmark that one.