A thorough pre trip inspection is one of the most important responsibilities of any Class B CDL operator. Public works drivers rely on dump trucks, plow trucks, refuse trucks, and other heavy vehicles every day. Identifying defects before leaving the yard prevents breakdowns, improves road safety, reduces costs, and ensures compliance with DOT regulations. This guide walks crews through the essential steps of a Class B commercial vehicle pre trip inspection.
By the end of this training, workers should be able to:
• Understand the purpose and legal requirements of a pre trip inspection.
• Identify critical vehicle components that must be inspected.
• Perform an exterior and interior walkaround.
• Recognize unsafe defects that require repair before operation.
• Properly document pre trip findings according to agency policy.
• A Class B truck for demonstration
• Checklist or inspection form used by your agency
• Flashlight for underbody inspections
• Wheel chocks
• PPE including gloves, high visibility vest, and safety footwear
"Good morning everyone. Today we are going to review how to complete a proper Class B CDL pre trip inspection. This inspection is required by law and protects both you and the traveling public. A few minutes spent checking your truck can prevent mechanical failures, crashes, and costly repairs. We will walk through each step so you know exactly what to look for before heading out on the road."
• Operating a vehicle with defective brakes or steering
• Tire blowouts due to improper inflation or damage
• Fluid leaks leading to overheating or engine failure
• Inoperative lights reducing visibility
• Loose or missing parts that may fall from the vehicle
• Failure to notice damage from the previous shift
• Skipping inspection steps due to time pressure
Secure the truck. Park on level ground, set the parking brake, and chock wheels if required.
Use PPE. Wear a high visibility vest, gloves, and safety footwear.
Perform a general overview. Look for leaks, puddles, leaning, or damage.
Check under the hood:
• Oil level
• Coolant level
• Power steering fluid
• Belts and hoses for cracks or wear
• Battery connections
• No loose or missing components
Inspect the front of the vehicle:
• Headlights, clearance lights, turn signals
• Grill and radiator condition
• Windshield for cracks
• Wipers and washer fluid
Check steering components:
• Steering box, hoses, linkage, tie rods, and pitman arm
• No excessive play or leaks
Inspect suspension:
• Leaf springs, hangers, shackles, and air bags
• Shocks secure and not leaking
Inspect brakes:
• Brake hoses, slack adjusters, chambers, and drums or rotors
• No audible air leaks
• Proper push rod travel (air brake systems)
Check tires and wheels:
• Proper inflation
• No cuts, bulges, or exposed cords
• Tread depth meets requirements
• Rims not cracked or damaged
• Lug nuts tight
• Hub oil level adequate
Walk down both sides of the vehicle:
• Mirrors clean and secure
• Handrails and steps secure
• Fuel tank secure with no leaks
• Exhaust system free of leaks and secure
Check rear of vehicle:
• Brake lights, turn signals, marker lights
• Mudflaps secure
• Tailgate and body hardware secure
Inspect dump body or specialized equipment:
• Hydraulics not leaking
• Locking pins or safety props functional
• PTO operation (if applicable)
Cab inspection:
• Seat belt functioning
• Horns operational
• Heater and defroster operational
• Mirrors adjusted
• Gauges functioning: oil pressure, coolant temp, air pressure
• Parking brake and service brake test
Air brake check (if applicable):
• Static test
• Applied pressure test
• Low air warning activation
• Emergency brake automatic engagement
Document everything. Note defects and notify a supervisor. Vehicles with safety deficiencies must not be operated.
• Demonstrate how to safely open the hood and check fluids.
• Show the proper method for inspecting tires and measuring tread depth.
• Perform a complete walkaround using the agency checklist.
• Demonstrate air brake system testing.
• Show how to document defects on the inspection form.
• Have each worker complete a partial or full pre trip inspection on a training truck.
• Provide defect examples and ask the crew whether the truck can be operated or must be taken out of service.
• Ask workers to identify missing or damaged components during a mock walkaround.
• Create small groups to compare their inspection techniques.
• What pre trip steps are most commonly skipped under time pressure?
• What defects must be repaired before the vehicle can be operated?
• How can we improve consistency in our inspection process?
• How often do you check your vehicle during the shift?
• Why is documentation just as important as the inspection itself?
Insert your agency’s specific pre trip form, out of service criteria, reporting procedures, maintenance contact information, and any state DOT regulations that apply.
• High visibility vest
• Work gloves
• Safety boots with slip resistant soles
• Safety glasses when checking underbody or dealing with leaks
• Hearing protection if working near running engines in enclosed areas
• A Class B CDL pre trip inspection is required and prevents major breakdowns.
• Inspect the entire vehicle including engine, brakes, tires, suspension, and lighting.
• Look for leaks, loose components, and signs of wear.
• Test air brakes and all gauges.
• Document all findings and report defects before leaving the yard.
Why is a pre trip inspection required?
a. To satisfy paperwork
b. To comply with DOT rules and ensure safety
c. To speed up travel time
True or False: A truck with a leaking brake chamber can be driven if the trip is short.
What should you check under the hood during a pre trip inspection?
(Short answer)
What is the purpose of the air brake applied pressure test?
(Short answer)
When must a defect be reported?
a. Only if the driver thinks it is serious
b. At the end of the work week
c. Immediately, according to agency policy
Please note that pre-trip inspection requirements vary from state-to-state. Your Class B drivers should be very aware of what they are to expected to inpsect. Your department may include other inspection points too.
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