CDL Pre-Trip Inspection 2

Question 1

What is the minimum tread depth required for front tires on a commercial vehicle?

Accepted Answer

4/32 of an inch

Answer

Front tires must have a minimum tread depth of 4/32 of an inch, while drive and trailer tires require a minimum of 2/32 of an inch.

Question 2

Which components must be checked when inspecting the air brake system during a pre-trip inspection?

Accepted Answer

Brake lines, connections, chambers, slack adjusters, and brake pads or linings

Answer

A thorough brake inspection covers all components including air lines, connections, brake chambers, slack adjusters, and pad or lining thickness and condition.

Question 3

What is the correct method to verify tire inflation pressure during a pre-trip inspection?

Accepted Answer

Use a tire pressure gauge to check that each tire meets the manufacturer's recommended pressure

Answer

A calibrated tire pressure gauge must be used to verify that each tire is inflated to the correct pressure; visual inspection cannot accurately detect underinflation.

Question 4

What should you look for when inspecting wheel rims during a pre-trip inspection?

Accepted Answer

Cracks, damaged areas, and that all lug nuts are present and tightened

Answer

Rims must be inspected for cracks, physical damage, and proper lug nut installation to prevent catastrophic wheel separation while driving.

Question 5

What must be verified when checking headlights during a pre-trip inspection?

Accepted Answer

Both low and high beams work, and lights are clean and properly aimed

Answer

Both low and high beams must function, and lights should be clean and properly aimed to provide adequate illumination without creating a hazard for oncoming drivers.

CDL Practice Test

CDL Practice Test

CDL Pre-Trip Inspection 2