Originally Posted by butcher_boy
there was one valve running from the engine to the cabin. I turned that off aswell. (think that was the airbrakes).
You might want to have someone explain some of the systems before you hurt yourself or someone else. If you are not familiar with your brake system, you should not be driving that bus. Last thing you want is to drive up someone's ass with a 20,000 pound bus because your brakes are not working properly. Air brakes are completely different than what you have in your car. Maybe you can stop by a school bus yard and one of the mechanics will give you a quick rundown if you ask nicely.