Recently i removed my cruise control on my 89 formula 350 ( to clean out the engine bay, since I do little driving that would require it.) My question is simple.. of the large hoses that goes to it ( the smaller being a vaccum and i blocked that off) where does that lead too. I have followed it as far as the interior of the car, but is there some sort of vacuum controled switch inside or am i completly off the mark? soon i will remove it completly to be sold on ebay, adn make a nice job of it, but for right now i was just wondering if anyone knows what this hose is for.

 

That hose, on my car at least, goes to a vacuum switch that is mounted on the brake pedal. There should be two of them there, one is electrical and is for the brake lights, and the other one is what you describe. Mine was white and had a large nipple pointing towards the driver seat that's home for the hose you describe.