CDL COMBINATION & AIR BRAKE
TEST CORRECT 100%
Tractor Protection Values - ANSWER -It keeps air in the tractor in the event the trailer
air leaks
- It is controlled by the trailer air supply valve in the cab
-It will close automatically if air pressure is low
If one of the glad hands on your blue air line is missing a seal... - ANSWER You might
end up with a service line air leak.
Which one of the following is controlled by the foot brake? - ANSWER The Service air
line
If you cross your air lines on a new trailer with spring brakes... - ANSWER you won't be
able to release the trailer brakes
When you inspect the coupling, check to ensure that... - ANSWER there's a little slack
in the air lines
You can damage the landing gear if you... - ANSWER back under the trailer at an angle
When traveling under 40 mph, you should follow other vehicles... - ANSWER With a
distance of one second for every ten feet of your vehicle length
When uncoupling, it's a good practice to... - ANSWER - couple the glad hands together
-couple the glad hands to dummy couplers
-hang the electrical cable with the plug end down
The trailer hand valve should be used... - ANSWER Only to test the trailer brakes
In order to supply air to the trailer, you must first... - ANSWER Push in the tractor
protection valve
The earliest way to notice a trailer skid is... - ANSWER By seeing it in your mirrors
Before you begin coupling.... - ANSWER Check your path for Hazards
You should crank the landing gear until... - ANSWER It is as far up as it will go
, When coupling the trailer, back up slowly until... - ANSWER The fifth wheel just
touches the trailer
The trailer should be lowered so that... - ANSWER it's raised slightly when the tractor's
backed under it
In order to inspect the coupling you should... - ANSWER use a Flashlight
A kingpin is.... - ANSWER A pin which locks the trailer to the tractor on the fifth wheel
The trailer air supply control... - ANSWER Is a red, 8 sided knob
The fifth wheel should be checked to see if... - ANSWER There is any damage or
missing parts
It is properly greased
The jaws are open
You are coupling a semi trailer to your tractor but have not yet backed under. The trailer
is at the right height when: - ANSWER It will be raised slightly when the tractor is
backed under it.
You should not back a tractor under a trailer until the whole air system is: - ANSWER
At normal pressure
Which part of the kingpin should the locking jaws close around? - ANSWER The shank
You supply air to the trailer tanks by: - ANSWER Pushing in the trailer air supply valve.
You have a major leak in the service line and you put on the brakes. Service air
pressure will escape and cause the: - ANSWER Trailer emergency brakes to come on.
Air lines on a combination vehicle are often colored to keep them from getting mixed up.
The emergency line is ____; the service line is ____. - ANSWER Red, Blue
The safety catch for the fifth wheel locking lever must be ____ for a coupling to be
complete. - ANSWER Over the locking level
The front trailer supports are up and the trailer is resting on the tractor. Make sure: -
ANSWER There is enough clearance between the tractor frame and the landing gear.
There is enough clearance between the tops of the tractor tires and the nose of the
trailer.
When backing under a tractor under a trailer you should expect: - ANSWER Trailer will
be lifted slightly when the tractor backs under it.
TEST CORRECT 100%
Tractor Protection Values - ANSWER -It keeps air in the tractor in the event the trailer
air leaks
- It is controlled by the trailer air supply valve in the cab
-It will close automatically if air pressure is low
If one of the glad hands on your blue air line is missing a seal... - ANSWER You might
end up with a service line air leak.
Which one of the following is controlled by the foot brake? - ANSWER The Service air
line
If you cross your air lines on a new trailer with spring brakes... - ANSWER you won't be
able to release the trailer brakes
When you inspect the coupling, check to ensure that... - ANSWER there's a little slack
in the air lines
You can damage the landing gear if you... - ANSWER back under the trailer at an angle
When traveling under 40 mph, you should follow other vehicles... - ANSWER With a
distance of one second for every ten feet of your vehicle length
When uncoupling, it's a good practice to... - ANSWER - couple the glad hands together
-couple the glad hands to dummy couplers
-hang the electrical cable with the plug end down
The trailer hand valve should be used... - ANSWER Only to test the trailer brakes
In order to supply air to the trailer, you must first... - ANSWER Push in the tractor
protection valve
The earliest way to notice a trailer skid is... - ANSWER By seeing it in your mirrors
Before you begin coupling.... - ANSWER Check your path for Hazards
You should crank the landing gear until... - ANSWER It is as far up as it will go
, When coupling the trailer, back up slowly until... - ANSWER The fifth wheel just
touches the trailer
The trailer should be lowered so that... - ANSWER it's raised slightly when the tractor's
backed under it
In order to inspect the coupling you should... - ANSWER use a Flashlight
A kingpin is.... - ANSWER A pin which locks the trailer to the tractor on the fifth wheel
The trailer air supply control... - ANSWER Is a red, 8 sided knob
The fifth wheel should be checked to see if... - ANSWER There is any damage or
missing parts
It is properly greased
The jaws are open
You are coupling a semi trailer to your tractor but have not yet backed under. The trailer
is at the right height when: - ANSWER It will be raised slightly when the tractor is
backed under it.
You should not back a tractor under a trailer until the whole air system is: - ANSWER
At normal pressure
Which part of the kingpin should the locking jaws close around? - ANSWER The shank
You supply air to the trailer tanks by: - ANSWER Pushing in the trailer air supply valve.
You have a major leak in the service line and you put on the brakes. Service air
pressure will escape and cause the: - ANSWER Trailer emergency brakes to come on.
Air lines on a combination vehicle are often colored to keep them from getting mixed up.
The emergency line is ____; the service line is ____. - ANSWER Red, Blue
The safety catch for the fifth wheel locking lever must be ____ for a coupling to be
complete. - ANSWER Over the locking level
The front trailer supports are up and the trailer is resting on the tractor. Make sure: -
ANSWER There is enough clearance between the tractor frame and the landing gear.
There is enough clearance between the tops of the tractor tires and the nose of the
trailer.
When backing under a tractor under a trailer you should expect: - ANSWER Trailer will
be lifted slightly when the tractor backs under it.
