Spring Brakes with ICC Brake Valve?

[artvonne]

  First cars I owned had single master cylinders, one leak and no brakes. First cars my Dad recalled had only rear brakes, only they were mechanical. Next came four wheel mechanical, then hydraulics. You still see Choppers with no front brake, though I think thats kinda nuts. So its really your point of reference more than anything. 

  While I admit I drove the Bus home with only the parking brake, I doubt I ever got the Bus over 30 mph, and would slow down so far in advance of a stop sign or turn I didn't really need to brake. And it was barely 3 miles and all back roads. And driveshafts don't normally explode without some warning.

[gus]

I've had plenty of U joints go with no warning and others with, all depends.

At 30 mph a 20,000 lb+ bus will roll for miles.