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2024 ILLINOIS CDL COMBINATION EXAM WITH CORRECT ANSWERS
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2024 ILLINOIS CDL COMBINATION EXAM WITH CORRECT ANSWERS
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2024 ILLINOIS CDL COMBINATIONEXAM WITH CORRECT ANSWERS
What two things are important to prevent rollover? - CORRECT-
ANSWERSKeep cargo as close to ground and load centered on your rig
When you turn suddenly while pulling doubles, which trailer is most likely to
turn over? - CORRECT-ANSWERSThe rear trailer is more likely to roll over.
Why should you not use the trailer hand brake to straighten out a jack
knifing trailer? - CORRECT-ANSWERSBecause the brakes on the trailer wheels
caused the skid and Once the trailer wheels grip the road again, the trailer
will start to follow the tractor and straighten out.
What is offtracking? - CORRECT-ANSWERSrear wheels follow a different path
than front wheels
How do you know if your trailer is equipped with antilock brakes? - CORRECT-
ANSWERSYellow ABS malfunction lamps on left side;ECU and wheel speed
sensor wires coming from the back of the brakes.
Which shut-off valves should be open and which closed? - CORRECT-
ANSWERSAll shut off valves except at back of trailer
Which shut off valve should be closed - CORRECT-ANSWERSBack of Trailer
How can you test that air flows to all trailers: - CORRECT-ANSWERSlisten -
open the emergency line shut off valve, you should hear air escaping
How can you test the tractor protection valve? - CORRECT-ANSWERSCharge
trailer air brake system. Shut off engine. Step on & off brake pedal. Control
should pop out at 20-45 psi.
How can you test the trailer emergency brakes? - CORRECT-ANSWERSCharge
the trailer air brake system and check that the trailer rolls freely. Then stop
and pull out the trailer air supply control
How can you test the trailer service brakes? - CORRECT-ANSWERSRelease
parking brakes, move forward slowly & apply trailer brakes with hand control
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