A good pre-trip inspection takes minutes and prevents the two worst starts to a day: a breakdown on the shoulder, or an out-of-service order at a scale.
1. Work in zones
Inspect the same way every time so nothing gets skipped:
- Engine compartment — fluid levels and leaks; belts and hoses; steering and brake components you can see.
- In the cab — gauges and air pressure build-up, horn, wipers, mirrors, seat belt, and emergency equipment (extinguisher, fuses, triangles).
- Lights and reflectors — headlights, signals, four-ways, brake and clearance lights; lenses clean and the right color.
- Tires and wheels — tread depth, inflation, cuts and bulges; lug nuts tight with no rust trails; hub oil seals.
- Brakes — hoses and lines, drums and shoes, slack adjusters within limits; listen for air leaks at full pressure.
- Trailer and coupling — frame and doors, landing gear, kingpin and fifth-wheel jaws locked, air and electrical lines secured.
2. Why it matters beyond test day
The vehicle inspection is the first part of the CDL skills test, but the habit is the point: inspection violations are among the most common roadside findings, and most are visible on a careful walk-around.
Learn each zone interactively in the vehicle inspection lessons, then quiz yourself with practice tests.