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Pre-Trip Inspection Free CDL Practice Tests
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Prepare For The Pre-Trip Inspection Portion Of Your CDL Written Exams

Pre-Trip Inspection Questions

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Air pressure drop on a single vehicle with brakes unapplied should be:
  • It should not be a concern
  • No more than 3 lbs in one minute
  • No more than 4 pounds in one minute
  • No more than 2 pounds in one minute
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From The CDL Manual

System Leak Check:

Shut off the engine, chock your wheels, (if necessary), release the tractor protection valve and parking brake (push in), 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). After checking the brake with brake applied, release the foot brake and watch the gauges with brake unapplied for one minute.

Check to see if the air pressure drops more than 2 pounds in one minute (single vehicle) or 3 pounds in one minute (combination vehicle).

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Low air warning devices should typically activate when air pressure drops:
  • Below 60 psi
  • More than 20 psi
  • To zero
  • Below 20 psi
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From The CDL Manual

Emergency System Check/Fan Down:

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 20-40 psi on a tractor-trailer combination vehicle, the tractor protection 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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When air pressure drops to between 20-40 psi:
  • The truck must be serviced
  • Low air warnings should come on
  • You should leave the truck
  • The parking brake should engage
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From The CDL Manual

Emergency System Check/Fan Down:

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 20-40 psi on a tractor-trailer combination vehicle, the tractor protection 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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To test the functionality of service brakes:
  • Pull forward at 5 mph, and apply the brakes
  • Let the truck roll down a steep incline, and gently apply the brakes
  • Pull forward at 15 mph, and pump the pedal furiously
  • Pull forward quickly, and push down hard on the pedal
Click here to look up the answer

From The CDL Manual

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 brake is applied.

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The steering box should be checked for:
  • Leaks or damaged hoses
  • Missing bolts or nuts
  • Secure mounting
  • You should be looking for all of these things
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From The CDL Manual

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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As part of your suspension inspection, you will check for cracks, leaks, or damage to all of the following except:
  • All of these things must be thoroughly inspected for any kind of wear or damage
  • Suspension mounts
  • Springs
  • Shock absorbers
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From The CDL Manual

Suspension

Springs/Air/Torque:

  • Look for missing, shifted, cracked or broken leaf springs.
  • Look for broken or distorted coil springs.
  • If vehicle is equipped with torsion bars, torque arms or other types of suspension components, check that they are not damaged and are mounted securely.
  • Air ride suspension should be checked for damage and leaks.

Mounts:

Look for cracked or broken spring hangers, missing or damaged bushings and broken, loose or missing bolts, u-bolts or other axle mounting parts. (The mounts should be checked at each point where they are secured to the vehicle frame and axle(s)).

Shock Absorbers:

See that shock absorbers are secure and that there are no leaks.

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All of the following are true of drum brakes except:
  • Brake linings should not be worn thin
  • They should be free of contaminates
  • Brake linings should be very thin
  • There should be no cracks, dents, or holes
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From The CDL Manual

Drum Brake:

  • Check for cracks, dents or holes. Also check for loose or missing bolts.
  • Check for contaminates such debris or oil/grease.
  • Brake linings (where visible) should not be worn dangerously thin.
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Rims with welding repairs:
  • Are acceptable if there are 2 or less repairs
  • Require a special permit
  • Are acceptable for use
  • Are prohibited
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From The CDL Manual

Wheels

Rims:

Check for damaged or bent rims. Rims cannot have welding repairs.

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Minimum tread depth on all tires except steer tires is:
  • 2/32-inch
  • 1/32-inch
  • 4/32-inch
  • 1/8-inch
Click here to look up the answer

From The CDL Manual

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 not permitted on bus steer tires.
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Minimum tread depth should be 4/32-inch on:
  • Trailer tires
  • All tires
  • Rear tires
  • Steer tires
Click here to look up the answer

From The CDL Manual

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 not permitted on bus steer tires.
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