commercial dl combo 2

whn hecking the trailer emegency brakes the tractor protection control valve should be placed in what position?

you have a major leak in the service line and you put on the brakes service air will escape and cause what?

when you get ready to back under a semitrailer you should line up.

the safety catch for the fifth wheel locking lever must be _____ for a coupling to be complete

before you back under a trailer make sure that?

when coupling the proper position of the fifth wheel is

when uncoupling the trailer, after you shutoff the trailer air supply and lock the trailer brakes, you should.