combo vehicles

if your emergency air line comes apart while driving, the loss of pressure will cause?

air brake equipped trailers made before 1975 often?

after connecting the air lines but before backing under the trailer you should?

you are coupling a tractor to a semitrailer, you have connected the air lines, before backing under the trailer you should

you supply air to the trailer tanks by?

after the trailer has been coupled to the tractor, the tractor protection control valve should be placed in what position.

off tracking or cheating causes what type of rig to follow the wider pass while making a turn?

the iron trailer supports are up and the trailer is resting on the tractor make sure

when uncoupling a loaded trailer you should lower the landing gear untill it?

the air leakage rate for a combo vehicle engine OFF brakes ON should be less than?