CDL Practice Tests: Pre-Trip Inspection

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Question #521 (1 of 10)

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What is the minimum tire tread depth allowed during a pre-trip inspection?

  • 2/32 on steering axle tires and 4/32 on all other tires
  • 4/32 on trailer axle tires and 2/32 on all other tires
  • 4/32 on drive axle tires and 2/32 on all other tires
  • 4/32 on steering axle tires and 2/32 on all other 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 #514 (2 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?

  • 10-30 psi
  • 80 - 100 psi
  • 20-45 psi
  • 60-80 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 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 #523 (3 of 10)

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

  • Any tires
  • Drive tires
  • Trailer tires
  • Steer 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 #515 (4 of 10)

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Describe the proper service brake check:

  • Pull forward at 5 mph, apply the emergency brake and stop. Check to see that the vehicle does not pull to either side and that it stops when the emergency brake is applied
  • While sitting still, release the parking brake and pump the service brake 5 times, then release it. Make sure the pressure does not drop more than 3 psi in one minute
  • Pull forward at 5 mph, apply the service brake and stop. Check to see that the vehicle does not pull to either side and that it stops when the brake is applied
  • All of these are correct

Service Brake Check

  • You will be required to check the application of air or hydraulic service brakes. This procedure is designed to determine that the brakes are working correctly and that the vehicle does not pull to one side or the other.
  • Pull forward at 5 mph, apply the service brake and stop. Check to see that the vehicle does not pull to either side and that it stops when the brake is applied.
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Question #520 (5 of 10)

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What should you check for on drum brakes during a pre-trip inspection?

  • Check for cracks, dents or holes. Also check for loose or missing bolts.
  • Check for contaminates, such as debris or oil/grease.
  • Brake linings (where visible) should not be worn dangerously thin.
  • All these are correct

Drum Brake

  • Check for cracks, dents or holes. Also check for loose or missing bolts.
  • Check for contaminates, such as debris or oil/grease.
  • Brake linings (where visible) should not be worn dangerously thin.
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Question #510 (6 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 #509 (7 of 10)

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Which is the proper procedure for checking hydraulic brakes?

  • Hold the brake pedal down. Make sure the pedal slowly moves all the way to the floor within 10 seconds
  • Pump the brake pedal three times and then hold it down for five seconds. The brake pedal should not move (depress) during the five seconds.
  • All these are correct
  • Pump the brake three times and watch the hydraulic pressure gauge to make sure it's building pressure

Hydraulic Brake Check (if equipped)

  • Pump the brake pedal three times and then hold it down for five seconds. The brake pedal should not move (depress) during the five seconds.
  • If equipped with a hydraulic brake reserve (back-up) system, with the key off, depress the brake pedal and listen for the sound of the reserve system electric motor.
  • Check that the warning buzzer or light is off.
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Question #512 (8 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 electrical power off 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
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 #517 (9 of 10)

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When checking the steering box components under the hood, what should you check for?

  • Look for any missing nuts, bolts and cotter keys
  • All these are correct
  • Check that the steering box is securely mounted and not leaking
  • Check for power steering fluid leaks or damage to power steering hoses

Steering Box/Hoses

  • Check that the steering box is securely mounted and not leaking. Look for any missing nuts, bolts and cotter keys.
  • Check for power steering fluid leaks or damage to power steering hoses.
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Question #508 (10 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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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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