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CDL Practice Test: Pre-Trip Inspection

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CDL Practice Test: Pre-Trip Inspection

Pre-Trip Inspection Questions

Click On The Picture To Begin

Good Luck!

When checking trailer air and electrical connections, you should:
  • All of these things should be checked
  • Make sure glad hands are locked in place, free of damage or air leaks
  • Check that trailer air connectors are sealed and in good condition
  • Make sure the trailer electrical plug is firmly seated and locked in place
This is a question from page 86 - click here to look up the answer

Quote From Page 121 Of The Illinois CDL Manual:

Air/electrical connections:

- Check that trailer air connectors are sealed and in good condition.
- Make sure glad hands are locked in place, free of damage or air leaks.
- Make sure the trailer electrical plug is firmly seated and locked in place.

Next
For belt driven engine components (water pump, alternator, air compressor, etc), how much free play is allowed at the center of each belt?
  • 3/4 inch of free play
  • 1.5 inches of free play
  • 1 inch of free play
  • No free play at all
This is a question from page 80 - click here to look up the answer

Quote From Page 116 Of The Illinois CDL Manual:

Engine compartment belts: Check the following belts for snugness (up to 3/4-inch play at center of belt), cracks or frays:

  • Power steering belt.
  • Water pump belt.
  • Alternator belt.
  • Air compressor belt.

TruckingTruth's Advice:

When checking belts, tell the examiner:

The belt is not cracked, frayed, or broken and free play is between 1/2in and 3/4in."

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Next
How can you tell if there is a leak in your exhaust system?
  • There will be rust visible in a particular spot
  • A loose fitting may cause a leak
  • All of these can be signs of an exhaust leak
  • There will be carbon soot collected into one area of the pipe
This is a question from page 84 - click here to look up the answer

Quote From Page 119 Of The Illinois CDL Manual:

Exhaust system:

  • Check system for damage and signs of leaks such as rust or carbon soot.
  • System should be connected tightly and mounted securely.

TruckingTruth's Advice:

While inspecting the exhaust system, tell the examiner:

"The exhaust should be properly mounted and secured, no loose clamps, no signs of leaks such as rust or soot, and it must contain no holes, cracks, or dents."

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Next
When checking the coolant level during the pre-trip inspection, you should:
  • Take a sample of the coolant to check for foreign debris
  • Be sure the coolant level is below the fill line
  • Only remove the radiator cap if the engine is hot
  • Never remove the radiator cap if the engine is hot
This is a question from page 80 - click here to look up the answer

Quote From Page 116 Of The Illinois CDL Manual:

Oil level:

  • Indicate where dipstick is located.
  • See that oil level is within safe operating range. Level must be above refill mark.

TruckingTruth's Advice:

When checking the coolant level, tell the examiner:

"The coolant level is filled above the minimum level and the reservoir is not cracked, broken, or leaking."

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Next
How should you perform a parking break check?
  • If the truck is equipped with a trailer hand valve, apply full pressure to the trailer service brakes then gently tug against the brakes in a low gear to be sure the brakes are functioning properly
  • Apply the parking brake only and make sure it will hold the vehicle by shifting into a low gear and gently pulling against the brake
  • Bring the truck to approximately 20mph then apply the parking and emergency brakes to see if they are effective in stopping the truck
  • Move forward in the lowest possible gear at idle speed, then apply the emergency brake and make sure you come to a full stop
This is a question from page 82 - click here to look up the answer

Quote From Page 117 Of The Illinois CDL Manual:

Parking brake check: Apply parking brake only and make sure it will hold the vehicle by shifting into a lower gear and gently pulling against the brake.

TruckingTruth's Advice:

To properly perform a parking break check, you must start the truck and build air to 120 to 125 psi. Place the transmission into a low gear. Release the yellow tractor park brake valve and do a light "tug" to be certain the trailer brakes hold the truck from rolling. Then, reverse the brake valves (set the tractor brakes and release the trailer brakes). Do a light tug again. The tractor brake should keep the truck from rolling. Here's what to say to the examiner:

"I will now perform a parking break check. I have a fully charged system and will check the trailer parking brakes first. [Do your trailer tug test here.] Now, I will check the tractor parking brakes. [Reverse the brakes and do your tractor tug test here.] Both the trailer parking brakes as well as the tractor parking brakes are functioning normally."

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Next
Which part has couplings (u-joints) that need to be checked:
  • Air Lines
  • Drive Shaft
  • Fuel Tank
  • Fifth Wheel
This is a question from page 84 - click here to look up the answer

Quote From Page 119 Of The Illinois CDL Manual:

Drive shaft:

  • See that drive shaft is not bent or cracked.
  • Couplings should be secure and free of foreign objects.

TruckingTruth's Advice:

When inspecting the drive shaft, tell the examiner:

"The drive shaft should not be twisted, cracked, bent or broken. U-joints must appear secure and free of foreign objects."

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Next
While inspecting the brake chamber, you should:
  • Make sure it's properly mounted and secure
  • Look for cracks and dents
  • Check for air leaks
  • You should do all of these things
This is a question from page 83 - click here to look up the answer

Quote From Page 118 Of The Illinois CDL Manual:

Brake chambers: Check that brake chambers are not leaking, cracked or dented and are securely mounted.

TruckingTruth's Advice:

After pointing out the location of a brake chamber, tell the examiner:

"I am now inspecting the brake chamber to make sure it's not cracked, bent, or broken. I'm also making sure it is properly mounted and secure and is not leaking."

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Next
During your pre-trip inspection, you must check the oil level and:
  • Show how to test the oil for water
  • Rub some oil between your fingers to make sure the oil is free of metal shards and foreign debris
  • Demonstrate how to add oil to the engine
  • Indicate where the dipstick is located
This is a question from page 80 - click here to look up the answer

Quote From Page 116 Of The Illinois CDL Manual:

Oil level:

  • Indicate where dipstick is located.
  • See that oil level is within safe operating range. Level must be above refill mark.

TruckingTruth's Advice:

What to say to the examiner:

"The dipstick should be pulled to show that the oil level is above the refill mark and in safe operating range."

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