CDL Pre-Trip Inspection Practice Test Guide: Pass with Confidence in 2025
The CDL Pre-Trip Inspection Test is one of the most important parts of the commercial driver’s licensing process. It proves that a driver understands how to inspect key vehicle components for safety and operational readiness. In this guide, you’ll learn everything you need to know to pass the CDL pre-trip inspection portion of your exam in 2025—step-by-step instructions, a full checklist, test tips, and sample questions.
What Is the Pre-Trip Inspection Test?
The Pre-Trip Inspection is a hands-on portion of the CDL skills test. You’ll walk around the vehicle and explain to the examiner how and what you inspect to ensure the truck or bus is safe to drive. The goal is to identify mechanical issues before starting a trip that could lead to breakdowns, accidents, or violations.
Why It Matters
- Helps prevent dangerous mechanical failures
- Ensures compliance with FMCSA and DOT regulations
- Improves safety for drivers, passengers, and cargo
- Prepares drivers for daily vehicle inspection reports (DVIR)
Test Format Overview
- Tested during the CDL skills exam (not multiple choice)
- Verbal demonstration of inspection items
- Performed on an actual commercial vehicle
- Must score 80% or higher to pass (criteria varies slightly by state)
Key Pre-Trip Inspection Areas
- Engine Compartment (fluids, belts, leaks)
- Cab Check / Engine Start (gauges, steering, brakes)
- Lights / Reflectors / Horn / Wipers
- Steering and Suspension Systems
- Brake Systems (air brakes, service/emergency)
- Trailer Coupling System
- Drive Shaft, Frame, and Exhaust
- Tires, Rims, and Lug Nuts
- Emergency Equipment (extinguisher, triangles, fuses)
- Under Vehicle Inspection
- Side and Rear Trailer Components
How to Pass the Pre-Trip Inspection Test
1. Memorize the Inspection Sequence
Follow a logical path—start at the front of the vehicle and work your way around to the back. Consistency helps retention.
2. Use Proper Terminology
Examiners are listening for phrases like “not cracked, bent, or broken,” “properly mounted and secured,” and “not leaking.” Use them repeatedly.
3. Take Practice Walk-Arounds
Repetition is key. Practice with a mentor or CDL instructor using a checklist and pointing to each part as you describe it.
4. Use Flashcards and Diagrams
Create or download visual aids and terminology cards to reinforce knowledge away from the truck.
5. Watch Video Demonstrations
Platforms like YouTube and training schools offer full walkthroughs with scoring tips and model responses.
Sample Pre-Trip Inspection Questions
- What should you say when inspecting the air compressor?
- How do you check the slack adjuster for free play?
- What’s the proper way to inspect the brake chamber?
- Where should reflective triangles be placed during a roadside emergency?
- What do you look for when inspecting the drive shaft?
Pre-Trip Inspection Checklist Summary
Below is a condensed version of a typical pre-trip checklist:
- Oil level, coolant, and power steering fluid
- Hoses, belts, water pump, and alternator
- Leaks under the vehicle
- Windshield, wipers, washers, mirrors
- Horn, gauges, lights, defroster
- Brake tests: air loss, warning, spring brake
- Coupling: kingpin, fifth wheel, apron, locking jaws
- Tires: inflation, depth, damage
- Rims, lug nuts, hubs, axle seals
- Reflectors, DOT tape, trailer doors
Test-Day Tips
- Stay calm—practice builds confidence
- Speak clearly and point to each part
- Don’t skip sections, even if you’re nervous
- Ask your examiner for clarification if unsure
- Dress appropriately—boots and gloves help
Conclusion
The CDL Pre-Trip Inspection Test is a crucial part of your commercial driving journey. It validates your ability to ensure vehicle safety, compliance, and readiness every day on the road. By studying Section 11 of your CDL manual, practicing with instructors or peers, and using this guide as a reference, you’ll be ready to pass with confidence in 2025 and take the wheel as a professional, safety-first commercial driver.