Free Class A CDL Pre-Trip Inspection Lesson from Alexis

Free Class A CDL Pre-Trip Inspection Lesson from Alexis

Every truck driver must perform a Class A Pre-Trip Inspection on their tractor trailer before hitting the road (hence, PRE-trip). This inspection serves to keep your vehicle in good working condition, and in turn, keeps you and others on the road safe. There’s also the monetary impact of having to pay for repairs, fines and more if you fail to properly inspect your big rig. There are several elements to the inspection, and it is important to remember all of them. In the video below, Alexis goes through each step of the Class A CDL Pre-Trip Inspection on a tractor trailer, and whether you drive a semi truck or not, you’ll definitely want to watch her show you how to properly inspect your truck before your next trip.


Here’s a breakdown of only the cab inspection portion of the video… I know I’ve missed a lot, but it’s an hour-long video, and I have little trucking knowledge so I might not have remembered everything. I wouldn’t mind watching the video again, though.


Marker Lights

Ensure that the marker lights are working, not broken or cracked, and are the proper color


Check to make sure the windshield is clean and is not broken or cracked and the wipers are in good condition and working properly


The hood should be in good condition, without damage, and should be locked securely


The grill must be present on the vehicle and mounted in a stable way. It should be clean, and not damaged or broken.


The mirrors must be clean, without cracks, and adjustable from inside the vehicle. The mirror brackets should be well-mounted to the door.


Check under the hood, and under the truck for any leaks

Belt-Driven Alternator

The belt-driven alternator should be securely mounted, and not be damaged, cracked or bent. All wires should be securely connected, and the belt shouldn’t show signs of excessive wear or cracking.

General Hoses

Hoses should be properly mounted and each end should be secure (be sure to check BOTH ends). There shouldn’t be any abrasions, or signs of damage.



Oil, steering fluid, coolant and all fluids should be checked and filled to the proper level. Unusually low fluid levels could be a sign of a leak or another problem.

Air Compressor and Steering Pump

The air compressor and steering pump should be properly mounted without signs of damage and should be checked for leaks

Steering Column

Should be properly mounted and not bent or broken

Tie rods, Pitman Arm and Drag link

Should be properly mounted and not bent or broken

Case Nuts and Cotter Pins

No nuts should be missing and the cotter pin should be present

Springs & Shocks

Ensure that there are no cracks in the leaf springs or shocks. Make sure the shocks are not leaking and that the U-Bolts and spring hangers are properly mounted and secure and are not damaged or bent.


Properly inspect all the brake elements. The brake hoses, brake chamber, slack adjuster, push rod, brake drums and lining are all securely installed and not bent or broken.

Wheels & Tires

Make sure the wheels are not bent or damaged, and that all of the lug nuts are present and secure. The hub seal must not be damaged or leaking and should be filled to manufacturer specs. Tires should be free of abrasions, and the tread depth should be no less than 4/32 of an inch. The gap between the dual tires should be properly spaced and free of debris.


Alright, I know nobody actually read the breakdown above. Let’s just have Alexis explain everything




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