Never | |
As soon as you start to jackknife | |
In the middle of the jackknife | |
When you start to recover from the jackknife |
Half | |
Less | |
More | |
The same amount of |
Supplies air to the footbrake and trailer handbrake | |
Marks the maximum refill point for air tanks | |
Carries air controlled by the footbrake or trailer handbrake | |
Distributes air throughout the cab and to each of the trailers |