I wanted to move the bus for Halloween last year, so I fired it up, and headed on down the road. Didn't check the brakes.
When I got to the end of the road, guess what happened. Yup, nothing. Pedal hard as a rock, no braking. I was too busy steering hard right into a busy intersection and trying not to hit the cars that were there, with tires smoking to reach for the parking brake.
Let me tell you, when you hit the frame of your bus on the ground at 20mph, it sends quite a shock to your dishes, pans, pots, drawers, and all kinds of stuff you never thought about before. I was pretty lucky, people made room, but not gladly.
I limped it home at about 5mph the next day, from only half a mile away.
I still haven't fixed it, got laid off, too much snow, etc. I need to figure out what happened pretty soon though.
I think it's air assisted hydraulic, and air assisted steering, because it was pretty difficult steering too.
I am hoping I can fix it myself.