7 pre trip inspection checklist items compared for Ontario drivers
A reliable pre trip inspection checklist keeps you legal, safe, and prepared for the road test or daily shift. This article compares seven essential checks against Ontario Ministry of Transportation (MTO) daily inspection expectations and explains how MELT, Class A (AZ) and Class D (DZ) training approach the same checks in practical terms. The MTO requires drivers to perform a daily vehicle inspection before each trip, commonly called a circle check or pre trip inspection, to confirm the vehicle is in safe operating condition. See the MTO daily trip inspection guidance for classes A and D for the legal baseline (MTO daily trip inspection).
Each numbered item below contains: what the MTO expects, how MELT/AZ/DZ training teaches the check, brief tolerances or measurement tips where appropriate, and short trainer tips you can apply before a road test. For a single page checklist adapted to women drivers see our tailored checklist, and for course options visit Caledon Truck Driving School.
1. Walkaround (circle check) for obvious defects
What the MTO expects: The MTO explicitly instructs drivers to do a daily vehicle inspection, a complete walkaround that identifies obvious defects affecting safe operation such as leaks, loose parts, or missing lamps. Perform this before moving the vehicle to ensure safety and compliance with daily inspection rules (MTO guidance).
How MELT training covers it
MELT lessons break the walkaround into consistent zones: front, curb side, curb side rear, driver side rear, driver side, and cab. Instructors teach a verbal checklist trainees use while walking the vehicle and stress documenting any defect and securing the vehicle before repair or reporting.
Quick steps and tips
- Start at the front: check lights, grille, visible coolant, and for fluid leaks.
- Move along each side: mirrors, glass, door latches, fuel caps, and visible suspension or brake parts.
- At the rear: inspect lights, splash guards, trailer coupling if fitted, and load security.
- Record defects on the daily inspection form and do not operate if a safety item is defective.
2. Tires and wheels: tread, pressure and secure fit
What the MTO expects: Ontario requires drivers to check tires and wheels as part of the pre trip inspection and sets minimum tread depths: rear tires must not have less than 1.5 millimetres of tread in two adjacent grooves, and front tires on a motor vehicle with a gross vehicle weight rating over 4,500 kilograms must have at least 3.0 millimetres in two adjacent grooves. Check for cuts, bulges, missing valve caps, and loose or missing fasteners as part of the daily inspection (MTO vehicle safety and daily inspections).
How MELT training covers it
MELT instructors demonstrate a two groove gauge or simple coin method to estimate tread and show how to check for sidewall damage and uneven wear. Trainees practise measuring and logging actual tread depths during classroom and yard sessions.
Practical tolerances and a rule of thumb
- Use a tread gauge where possible. Remove a tire from service if the cord shows through, if sidewall bulges are present, or if tread wears unevenly across the shoulder.
- Underinflation and overheating are common causes of roadside failure. Check pressures cold where feasible and follow the vehicle or tire manufacturer recommendations.
3. Lights, reflectors and electrical systems
What the MTO expects: Lighting and reflectors must be inspected daily to ensure visibility. Missing, cracked, or non functioning lamps and reflectors are defects you must identify and report before driving, according to MTO daily inspection requirements.
How MELT training covers it
MELT drills pair a quick walkaround with an in cab switch test so trainees verify each lamp type: headlights, tail, stop, turn, marker, clearance and licence plate lights. Trainers show how to check bulbs, lenses, mounts and obvious wiring chafing.
Fast checks
- Activate turn signals and hazard lights and walk the vehicle to confirm operation.
- Check lenses for clouding or cracks that reduce intensity.
- For DZ candidates in smaller vehicles, focus on required lights; AZ drivers must inspect all tractor, trailer and marker lamps.
4. Brakes and air systems: function, leaks and air brake test
What the MTO expects: Brake systems, including air systems on heavy vehicles, are part of the required daily inspection. Drivers must identify leaks, warning lights, or any condition that may impair braking performance.
How MELT training covers it
MELT and Z endorsement lessons teach a short air brake routine: build air pressure, note governor cut in and cut out, observe air pressure drop during applied tests, listen for audible leaks and confirm parking and service brake operation. Instructors demonstrate the static build test, applied leak test, and the low pressure warning verification used in training and practical evaluations.
Trainer tips
- Do a pre start air system listen: any hissing could indicate a leak.
- Confirm parking brake application and pedal or valve travel are within normal range during practice checks.
- AZ drivers must also inspect tractor trailer brake connections, glad hands and trailer brakes before coupling. Trainees practise uncoupling and checking trailer brakes during MELT and road test preparation.
5. Steering and suspension: looseness, mounts and shocks
What the MTO expects: Steering and suspension components that are loose, cracked or missing are safety defects you must identify during the daily inspection. The MTO daily check reminds drivers to note loose steering linkage, missing nuts or bolts, and damaged mounts.
How MELT training covers it
Instructors teach tactile and visual checks: feel for excessive play in steering components, look for damaged tie rods or missing fasteners, and inspect springs and shock mounts for cracks or broken leaves. Trainees are shown how to push and pull key components safely to reveal looseness without risking damage.
What to look for
- Excessive free play in the steering wheel, separated boots on tie rod ends, or cracked spring eyes.
- Damaged or misaligned shocks and broken spring leaves, especially common on heavily loaded units.
6. Coupling devices, trailer components and secure connections
What the MTO expects: For tractor trailer combinations the coupling assembly, locking jaws, kingpin, safety chains and the air and electrical connections must be secure and functional. Any defect that could cause separation or loss of control is a reportable condition under the daily inspection rules.
How MELT training covers it
MELT training teaches an ordered coupling and uncoupling routine: visually inspect the fifth wheel, check locking jaw engagement, ensure the kingpin and plate are free of damage, secure safety devices, and verify glad hands and electrical plugs seat properly without leaks or chafing. Trainers require trainees to perform pre move checks after coupling.
AZ vs DZ emphasis
Coupling device checks are high priority for AZ tractor trailer drivers. Most DZ candidates in light commercial vehicles will not perform fifth wheel checks but should inspect any tow or hitch connections and trailer lights.
7. Cargo securement, emergency equipment and paperwork
What the MTO expects: The daily inspection includes confirming load security and required equipment are present. While specific cargo securement standards vary by load type, drivers must identify loose loads and missing emergency equipment before departure.
How MELT training covers it
MELT lessons include basic cargo restraint methods and demonstrate common tie down practices, centre of gravity considerations and how to check tarps and straps for wear. Training also covers the paperwork routine: daily inspection forms, logbook or electronic records, permits and any hazardous goods documents if applicable.
If you find a defect
- Do not operate the vehicle if the defect compromises safety. Tag the vehicle, notify your supervisor, and record the defect on the daily inspection report.
- Minor non safety defects should be logged and scheduled for repair according to company policy.
Printable one page pre trip inspection checklist
Use this condensed list to print and keep in the cab as your working pre trip inspection checklist. Read each item, mark any defects, and follow company reporting rules.
- Walkaround: visible leaks, glass, mirrors, door latches.
- Tires and wheels: tread, sidewalls, valve caps, lug nuts.
- Lights and reflectors: bulbs, lenses, mountings, wiring.
- Brakes and air: parking and service brake function, audible leaks, air warnings.
- Steering and suspension: play, mounts, springs and shocks.
- Coupling and trailer: fifth wheel, kingpin, glad hands, security chains.
- Cargo, emergency kit and paperwork: tie downs, triangles, extinguisher if required, inspection form.
Frequently asked questions
Is a pre-trip inspection required every day in Ontario?
Yes. The MTO requires drivers to perform a daily vehicle inspection before starting the day’s trip to determine the vehicle is in safe operating condition. This is a legal obligation for classes A and D and the core reason for the circle check (MTO daily trip inspection).
What tire tread depth is legal for commercial vehicles in Ontario?
Ontario sets minimum tread depths in its vehicle safety guidance: rear tires must not have less than 1.5 millimetres of tread measured in two adjacent grooves, and front tires on motor vehicles with a gross vehicle weight rating over 4,500 kilograms must have at least 3.0 millimetres in two adjacent grooves. See the MTO vehicle safety and daily inspections page for the official wording (MTO).
Do I need an Air Brake Z endorsement to perform the air brake checks on a tractor trailer?
If you operate a vehicle with an air brake system you must hold the Z endorsement to operate that vehicle independently. MELT and Z endorsement training teach the air brake test procedures and safety checks; trainees may perform checks under instructor supervision during training but legal operation of air brake vehicles requires the appropriate endorsement.
How long should a proper pre trip inspection take before a shift or a road test?
A full careful pre trip inspection for a large tractor trailer typically takes 10 to 20 minutes depending on experience and vehicle configuration; light commercial vehicles often require less time. MELT trains students to be efficient and thorough: build a consistent routine and document defects to avoid last minute delays.
Key takeaway: Practice a consistent circle check that covers the seven items above, learn the measurement tips for tires and air systems, and always document defects. For guided MELT, AZ/DZ and Air Brake (Z) training, and to arrange road test preparation or a free driver assessment, visit Caledon Truck Driving School or see our specialized trucking checklist for women drivers for a tailored version you can print and keep in the cab.
References: Ontario MTO daily trip inspection guidance and vehicle safety and daily inspections pages provide the legal baseline for the checks described above: daily trip inspection, and vehicle safety, maintenance and daily inspections.
