Check out this video.

http://www.youtube.com/watch?v=FBp_bfWkWEc

Its called gravity. Haha

They knew it would stop at some point. Didn't seem to worried after it started down the hill.

Probably is good they do not pump concrete.? Or maybe they Do...???

your right here they are using air to clean the hose.

http://video.concretepumping.com/videos/850/concrete-pump-blowing-out-with-air.-crazy

The guy was lucky he didn't get stuck between the car and the building!!

I've seen that video before todd. Serious amature pumper. Shocking...

How do the hosecleaningguy do when he clean the hose in an expencive fancy neighbourhood? And beside alot of very expencive cars (as my usually pumpjob in Stockholm-city). Collect the hoses and run fast.