CDL Practice Tests: Pre-Trip Inspection

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Question #513 (1 of 10)

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When doing an emergency system check on air brake systems, the low air warning device (buzzer, light, other) should activate when the pressure gets below what reading?

  • 100 psi
  • 60 psi
  • 140 psi
  • 80 psi
Emergency System Check. Turn electrical power on and begin fanning off the air pressure by rapidly applying and releasing the foot brake. Low air warning devices (buzzer, light, other) should activate before air pressure drops below 60 psi. Continue to fan off the air pressure. Normally within the range of 20-45 psi on a tractor-trailer combination vehicle, the tractor parking valve, and parking brake valve should close (pop out). On other combination vehicle types and single vehicle types, the parking brake valve should close (pop out).
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Question #508 (2 of 10)

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Which is the proper procedure for checking the trailer parking brakes?

  • Gently trying to pull forward with the trailer parking brake on
  • Measure the distance between the parking brake shoe and the drum. Make sure it is less than 1 inch
  • All these are correct
  • Check the angle of the S-cam coming out of the brake chamber
Trailer (if applicable): With the tractor parking brake released and the trailer parking brake engaged (combination vehicles only), check that the trailer parking brake will hold the vehicle by gently trying to pull forward with the trailer parking brake on.
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Question #529 (3 of 10)

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When inspecting the air and electrical connections to the trailer, which of the following items does NOT need to be checked?

  • Make sure the trailer electrical plug is firmly seated and locked in place.
  • Check that trailer air connectors are sealed and in good condition.
  • Make sure the brake fluid lines are properly attached and not leaking
  • Make sure glad hands are locked in place, free of damage and oil/grease that can cause air leaks.

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 and oil/grease that can cause air leaks.
  • Make sure the trailer electrical plug is firmly seated and locked in place.
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Question #514 (4 of 10)

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When doing an emergency system check on air brake systems, the tractor parking valve and the trailer parking valve should close (pop out) when the pressure gets below what reading?

  • 20-45 psi
  • 80 - 100 psi
  • 60-80 psi
  • 10-30 psi
Emergency System Check. Turn electrical power on and begin fanning off the air pressure by rapidly applying and releasing the foot brake. Low air warning devices (buzzer, light, other) should activate before air pressure drops below 60 psi. Continue to fan off the air pressure. Normally within the range of 20-45 psi on a tractor-trailer combination vehicle, the tractor parking valve and the trailer parking valve should close (pop out). On other combination vehicle types and single vehicle types, the parking brake valve should close (pop out).
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Question #503 (5 of 10)

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When doing a pre-trip inspection of the engine compartment, which of the following are you NOT looking for?

  • Inspect hoses for condition and leaks.
  • Look for puddles on the ground.
  • Look for dripping fluids on the underside of the engine and transmission.
  • Make sure the air lines are properly attached to the trailer

Engine Compartment (Engine Off) Leaks/Hoses

  • Look for puddles on the ground.
  • Look for dripping fluids on underside of engine and transmission.
  • Inspect hoses for condition and leaks.
The air lines do not connect to the trailer inside the engine compartment.
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Question #507 (6 of 10)

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Which of the following is NOT one of the dash indicators you will look for during your pre-trip inspection?

  • Left turn signal indicator
  • Antilock Braking System (ABS) indicator
  • Air lines reversed indicator
  • Four-way emergency flashers

Test that dash indicators work when corresponding lights are turned on:

  • Left turn signal
  • Right turn signal.
  • Four way emergency flashers.
  • High-beam headlight.
  • Antilock Braking System (ABS) indicator.
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Question #523 (7 of 10)

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Re-grooved or re-capped tires are not permitted on:

  • Any tires
  • Trailer tires
  • Steer tires
  • Drive tires

The following items must be inspected on every tire:

  • Tread depth: Check for minimum tread depth (4/32 on steering axle tires and 2/32 on all other tires).
  • Tire condition: Check that tread is evenly worn and look for cuts or other damage to tread or sidewalls. Also, make sure that valve caps and stems are not missing, broken or damaged.
  • Tire inflation: Check for proper inflation by using a tire gauge or a mallet. Note: You will not get credit if you simply kick the tires to check for proper inflation.
  • That there is no mismatch tires (size and construction).
  • Re-grooved or re-capped tires are not permitted on bus steer tires.
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Question #510 (8 of 10)

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When doing an air brake system leak check, which of the following is the correct setup for the test?

  • Build the air pressure until it is between 50 - 60 pounds, keep the engine running, chock your wheels, (if necessary), release the tractor parking valve and trailer parking valve
  • With the air pressure built up to the governor cut-off (120-140 psi), shut off the engine, chock your wheels, (if necessary), release the tractor parking valve and trailer parking valve
  • None of these are correct
  • With the air pressure built up to the governor cut-off (120-140 psi), shut off the engine running, chock your wheels, (if necessary), and engage the tractor parking valve and trailer parking valve
System Leak Check. With the air pressure built up to the governor cut-off (120-140 psi), shut off the engine, chock your wheels, (if necessary), release the tractor parking valve and trailer parking valve (combination vehicles), fully apply the foot brake and hold it for one minute. Check the air gauge to see if the air pressure drops more than 3 pounds in one minute (single vehicle) or 4 pounds in one minute (combination vehicle).
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Question #527 (9 of 10)

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In addition to checking for spare electrical fuses (if equipped), three red reflective triangles and a properly charged and rated fire extinguisher, school bus drivers must also inspect which of the following emergency equipment?

  • Tool kit and tire patching kit
  • None of these are correct
  • Emergency flares and flashlight
  • First aid kit and body fluid cleanup kit

In addition to checking for spare electrical fuses (if equipped), three red reflective triangles and a properly charged and rated fire extinguisher, school bus drivers must also inspect the following emergency equipment:

  • First Aid Emergency Kit
  • Body Fluid Cleanup Kit
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Question #512 (10 of 10)

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When doing an emergency system check on air brake systems, how do you begin the test?

  • Turn the engine on and begin fanning off the air pressure by rapidly applying and releasing the foot brake
  • Turn electrical power on and begin fanning off the air pressure by rapidly applying and releasing the foot brake
  • Turn off the electrical power and begin fanning off the air pressure by pulling out the red parking brake knob
  • Turn electrical power off and begin fanning off the air pressure by rapidly applying and releasing the foot brake
Emergency System Check. Turn electrical power on and begin fanning off the air pressure by rapidly applying and releasing the foot brake. Low air warning devices (buzzer, light, other) should activate before air pressure drops below 60 psi. Continue to fan off the air pressure. Normally within the range of 20-45 psi on a tractor-trailer combination vehicle, the tractor parking valve and parking brake valve should close (pop out). On other combination vehicle types and single vehicle types, the parking brake valve should close (pop out).
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About The Pre-Trip Inspectin CDL Exam

The The Pre-Trip Inspectin portion of the CDL Exam is required to obtain your CDL. During the pre-trip inspection, you must show that the vehicle is safe to drive. You may have to walk around the vehicle and point to or touch each item and explain to the examiner what you are checking and why. You will NOT have to crawl under the hood or under the vehicle.

Drivers need to have knowledge of how the actual vehicle(s) that they are conducting the test in operate. The drivers need to be able to explain and demonstrate different checks for the examiner as requested.

Taking the CDL Pre-trip Inspection Test

Class A Pre-trip Inspection Test

If you are applying for a Class A CDL, you will be required to perform a pre-trip inspection in the vehicle you have brought with you for testing. The vehicle must be a combination vehicle, representative of the unit you will be driving and must meet the class weight requirements. If the vehicle is an air brake vehicle, you must first pass the air brake knowledge test. You also must have passed all applicable endorsement knowledge tests that pertain to the vehicle you bring in for testing. Your test will require an inspection of the areas of the vehicle as instructed by your CDL examiner.

Class B and C Pre-trip Inspection Test

If you are applying for a Class B or C CDL, you will be required to perform a pre-trip inspection in the vehicle you have brought with you for testing. The vehicle must be a straight truck, passenger bus or school bus, representative of the vehicle you will be driving and must meet the class weight requirements. If the vehicle is an air brake vehicle, you must first pass the air brake knowledge test. You also must have passed all applicable endorsement knowledge tests that pertain to the vehicle you bring in for testing. Your test will require an inspection of the areas of the vehicle as instructed by your CDL examiner.

TruckingTruth's Pre-Trip Inspection Study Guide

We have an excellent Pre-trip Inspection Study Guide which includes a complete pre-trip inspection with photos and descriptions, numerous pre-trip inspection videos, and a complete vehicle checklist.

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