Tom/Barb wrote:
I would bet that when a coach sets a week on the level jacks with out moving, it will set there 15 minutes more while Mike slides under there and changes a brake canister fitting.
No.... Bad assumption. When you go under you TOUCH stuff. Either a hose, a pipe, a valve, you move a hydraulic line out of the way to see better, next thing you know, coach comes down.
Do a search for "Rolls Royce Phanthom kills technician". A poor guy had a Rolls on a lift but did not lock it correctly. When he went under and starter looking at a bolt in the exhaust, the car came down.
It is a really good example on how even when you believe you are safe but you missed a minor safety backup, you could be in trouble.