CDL Pre-Trip Inspection Checklist
The pre-trip inspection is one of the most-failed parts of the CDL exam. This complete checklist walks you through every component an examiner expects you to identify — in the right order.
Read the Full Checklist →Engine Compartment
- Oil level and leaks
- Coolant level and hoses
- Power steering fluid
- Belts (alternator, water pump)
- Battery and connections
- Wiring (no cracks or frays)
Front of Vehicle
- Lights and reflectors clean and working
- Windshield free of cracks
- Wipers and washer fluid
- Mirrors adjusted and secure
- Tires: tread depth, inflation, no damage
Side & Suspension
- Door hinges and seal
- Fuel tank secure, cap tight
- Drive shaft straight and clean
- Springs, shocks, and U-bolts intact
- Frame and crossmembers
Rear & Trailer
- Lights and reflectors
- Mud flaps secure
- Trailer coupling and fifth wheel
- Brake lines properly connected
- Cargo secured, doors latched
In-Cab Inspection
- Air gauge builds 85–100 psi in 45 sec
- Low-air warning at 60 psi
- Service brake check
- Parking brake holds
- Steering play under 10°
- Horn, defroster, heater, and gauges
Why the Pre-Trip Inspection Matters
Examiners use the pre-trip inspection to test more than memory — they want to see that you understand vehicle safety. Verbalize each check, point to the component, and explain what you're looking for. A confident, structured walkaround is the single biggest factor that separates passing scores from failures.
Frequently Asked Questions
Get the Complete Pre-Trip Checklist
Read the full step-by-step pre-trip inspection guide with examiner tips and memorization techniques.
Read the Full Guide