How to Do a Pre-Trip Inspection: A Step-by-Step Guide

The pre-trip inspection is the first skill every commercial driver learns and one of the most heavily tested. Learn the order that keeps you from missing anything.

A pre-trip inspection is a systematic check of the tractor and trailer before you drive. It protects you, other road users and your employer, and it is a required part of your road test. Examiners are not looking for a rushed walk-around. They want to see that you can find defects methodically and explain what you are checking and why.

Why the order matters

Most drivers learn the inspection as a fixed route around the truck. Following the same sequence every time means you never skip a component, even when you are tired or the weather is bad. Pick an order, practise it until it is automatic, and use it for every inspection.

Step 1: Engine compartment

With the engine off and the cab tilted or the hood open as appropriate, check:

• Engine oil, coolant and power steering fluid levels
• Belts for cracks, fraying and correct tension
• Hoses for leaks, bulges and wear
• Wiring for loose or chafed insulation
• Signs of fluid leaking onto the ground beneath the engine

Step 2: Cab and gauges

Start the engine and watch the gauges. Oil pressure should rise quickly. Confirm the dash warning lights go out, then check the horn, wipers, washers, heater and defroster, mirrors, seat belt and all of your lights. Make sure your emergency equipment, such as the fire extinguisher and warning triangles, is present and secured.

Step 3: Tires, wheels and suspension

Walk the truck and check every tire for correct inflation, cuts, bulges, uneven wear and embedded objects. Look at the rims for cracks and the lug nuts for looseness or rust trails, which can indicate a nut working free. Inspect springs, shock absorbers and mounts for breaks, leaks or shifted components.

Step 4: Brakes and air system

The air brake system gets special attention because brake failures cause some of the most serious collisions. Check the slack adjusters, brake chambers, air lines and hoses for damage and leaks, and inspect the drums or rotors and linings. Then complete the air brake tests: build pressure, check the governor cut-in and cut-out, listen for leaks and confirm the low-air warning and spring brakes work as designed.

Step 5: Coupling area

Look closely at the fifth wheel, the kingpin and the locking jaws. The trailer must be properly seated, the release handle fully locked and the safety latch in place. Check the glad hands, air hoses and electrical cord for secure connections.

Step 6: Trailer

Inspect the landing gear, lights and reflectors, doors and latches, the roof and sides for damage, and the cargo securement if the load is already on board. Confirm the tires and brakes on the trailer to the same standard as the tractor.

Record what you find

Any defect you find needs to be documented and reported according to your employer's procedure and the applicable regulations. Never drive a vehicle with a defect that makes it unsafe. Honest reporting is part of professional driving.

At JBA1 Driving School we practise the full inspection in the yard until it becomes second nature, and we have students narrate each step aloud so they are ready for the examiner. Strong inspection habits make for safer drivers and noticeably better road test results.