when i got my car the cruise didn't work and it turned out i was missing the grommet on the clutch pedal that catches the trigger. the brake pedal also has the same grommet/trigger. so i imagine your auto's brake pedal uses the same set up and you may be missing the grommet.
I need to check out a scrapyard like that. I went to one with a lot of subarus out in PA about 6 years ago when I had my 91 Legacy wagon and got a lot of good parts for dirt cheap. would love a scooped hood for my outback since my year didn't come with one
is yours installed like this? http://www.paranoidfabrications.com/directions/subarurs00/subarurs2000.htm
mine is installed following that, and it made a major difference in my car with overall running and idling smoothness.