Sorry I some how missed the replies for this thread...
If you look right below the resevoir, you should see a small sensor attached. This sensor detects when you step on the brakes and disables the cruise control. When this switch either fails or is unplugged, the cruise control will not work.
This is it:
http://www.oreillyauto.com/site/c/de...1967&ppt=C0039