After you connect the airlines, but before you back under the trailer, you shouldĪns: Supply airline two trailer system, then pull out of the air supply knob Why should you lock the air line glad hands to each other ( or dummy couplers) when you’re not towing a trailer For a coupling to be completed, the safety catch for a fifth-wheel locking lever must be If you cannot make a turn without entering another traffic lane, you should The trailer is at the right height whenĪns: It will be raised slightly on the tractor is backed up under it You are coupling a semi-trailer to your truck. A trailer is most likely to jackknife when Under good conditions, you should leave at least one second of space between your vehicle and the vehicle ahead of you for every_Feet your vehicles length The best way to tell if your trailer has started to skid is to You should not back a tractor under a trailer until the whole air system is A tractor with a_trailer requires the shortest stopping distance This means thatĪns: The coupling is not right and should be fixed before driving the coupled unit The fifth wheel locking lever is not locked after the jaws close around the kingpin. After you have coupled the trailer, you should begin rising the landing gear by using the_gear Which of these vehicles off track the mostĪns: Five-axle trailer towing a 52-foot trailer Under good driving conditions, you should leave at least one second of space between your vehicle and the vehicle ahead of you for every_Feet of your vehicle length When you get ready to back off a semi-trailer, you should lineup If you have a coupling with a semi-trailer, where should the front trailer support be before driving awayĪns: Fully raised with the crank handle secured and it’s a bracket How much space should be between the upper and lower fifth wheel after coupling The best way to tell if your trailer I started to skid is to Which should you hook before backing under the semi-trailerĪns: Service and emergency air lines from the truck to the trailer You have backed up but you were not under it. You are coupling a tractor to a semi-trailer. To unlock the fifth wheel, pull the release handle to the_ position A trailer is most likely to jackknife when it is Tractor with the_trailer requires the shortest stopping distance When checking the trailer’s emergency brakes, the tractor protection control valve should be placed in the_position. Make sureĪns: There’s enough clearance between the tractor frame and the landing gearĪns: Bobtail tractors can take longer to stop than a combination vehicle loaded to maximum gross weight The front trailer supports are up and the trailer is resting on the tractor. You should not move the tractor until the whole air system is You have pushed in the trailer supply valve.
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