CDL Pre-Trip Inspection Checklist — Step by Step
The CDL pre-trip inspection is the first part of the on-road Skills Test — and the one most people fail. It follows a fixed 7-step routine, and the whole thing is spoken: at each safety-critical part you name it, point to it, and say exactly what you are checking for. Below is a plain, step-by-step guide to each area, with the auto-fail points. Learn the items here, practice them out loud, then test yourself with free CDL questions.
Practice free CDL questions →The pre-trip, area by area
Practice vehicle-inspection questions →1. The 7-Step Inspection Method
The order the whole pre-trip follows: overview, engine, cab, lights, walkaround, signals, brake check.
Step-by-step guide →2. Engine Compartment
Under the hood: oil, coolant, hoses, belts, leaks and wiring — parking brake on before you open it.
Step-by-step guide →3. In-Cab & Engine-Start Check
Gauges, controls, mirrors, windshield, wipers, horn and emergency equipment before you move.
Step-by-step guide →4. Lights & Reflectors
Headlights, turn signals, brake and clearance lights, and reflectors — correct color, clean, working.
Step-by-step guide →5. External Walkaround
Steering, suspension, brakes, wheels and tires, frame and fuel — name, point to and explain each defect.
Step-by-step guide →6. Coupling System (Fifth Wheel)
Combination vehicles: fifth wheel, kingpin, apron, locking jaws, air and electrical lines.
Step-by-step guide →7. In-Cab Air Brake Check
The scored brake test: governor, build-up, leakage, low-air warning, spring brakes — auto-fail if wrong.
Step-by-step guide →