Never | |
When unloading | |
When parked on a grade | |
When parking for less than 10 minutes |
In the middle of the jackknife | |
As soon as you start to jackknife | |
When you start to recover from the jackknife | |
Never |
The tractor brakes would lock up | |
There would be no impact to the tractor brakes | |
The tractor would lose air pressure through the parted air lines | |
The tractor brakes would apply |