A truck pre-start inspection is a systematic check performed by the driver before every shift. It catches defects that could cause a breakdown, an accident or a roadside defect notice.
This guide covers the full pre-start process for rigid and articulated trucks, including engine bay, exterior walkaround, tyres, brakes, air system, coupling and cab checks.
Before you start
Grab your truck pre-start checklist, a pen, a torch, a tyre pressure gauge and a wheel nut indicator check tool. Review the previous shift's checklist to confirm any reported defects have been repaired. Park the truck on level ground, turn the engine off and apply the park brake. For articulated combinations, inspect the prime mover and trailer separately, then check the coupling. MapTrack's digital pre-start inspections let you complete the entire process from your phone.
Step-by-step pre-start
1. Check the engine bay
Open the bonnet (or tilt the cab on a cab-over truck). With the engine cold, check oil, coolant, power steering fluid and windscreen washer fluid against the OEM min/max marks. Inspect drive belts for cracks, fraying or glazing, and check hoses for leaks or swelling.
2. Exterior walkaround
Start at the driver's door and walk clockwise. Check all lights, indicators, clearance markers and reflectors. Confirm mirrors are clean and correctly adjusted. Look for body damage, cracked glass and fresh fluid leaks under the vehicle.
3. Inspect tyres, wheels and wheel nuts
Check every tyre on every axle. In Australia the legal minimum tread depth for heavy vehicles is 1.5 mm across the full contact width (see our tyre tread depth guide). Verify inflation against the placard value, look for cuts, bulges or embedded objects, and confirm wheel nut indicators are aligned.
4. Check brakes, air system and coupling
Start the engine and allow the air compressor to build to full system pressure. Check that the low-air warning activates at 55 to 65 psi. Perform a static leak-down test with the engine off for two minutes. Check brake pad wear indicators and drain air tank moisture. For articulated vehicles, confirm the coupling pin is locked, safety chain connected and trailer brake airlines secure.
5. Cab checks
Fasten the seatbelt and adjust mirrors. Check all gauges and warning lights. Test windscreen wipers, washers, heater and demister. Confirm steering feels normal through a small lock-to-lock check at idle.
6. Test safety systems
Test the horn, headlights (low and high beam), tail lights, brake lights, indicators, hazard lights, reversing alarm and reversing camera. A non-functioning horn or alarm is a tag-out defect on most sites.
7. Record and sign off
Complete the checklist, note defects, sign and date. If any defect makes the truck unsafe, tag it out of service and report the fault. Our pre-trip inspection guide covers the broader light and heavy vehicle process.
Common defects and actions
| Defect | Action required |
|---|---|
| Engine oil below minimum | Top up to correct level before departure |
| Coolant leak | Do not drive, report for immediate repair |
| Tyre below 1.5 mm tread | Replace tyre before driving |
| Wheel nut indicator misaligned | Re-torque wheel nuts, investigate cause |
| Brake pad wear indicator showing | Schedule brake service, assess if safe to drive |
| Low air pressure build-up | Do not drive, compressor or leak fault |
| Cracked windscreen | Replace if it impairs driver vision |
| Inoperative reversing alarm | Tag out until repaired |
Pre-start vs roadworthy inspection
| Aspect | Daily pre-start | Annual roadworthy |
|---|---|---|
| Frequency | Every shift | Annually (at registration renewal) |
| Who performs it | Driver | Licensed inspector |
| Depth | Visual and operational checks | Full mechanical assessment |
| Legal basis | WHS Regulations / NHVR / OSHA | State road authority |
| Record produced | Daily checklist | Roadworthy certificate |
The daily pre-start prevents unsafe vehicles from leaving the yard, while the annual roadworthy is a full mechanical assessment for registration. Download the trailer inspection checklist for trailer-specific items.
Regulatory requirements
In Australia, the NHVR National Heavy Vehicle Inspection Manual sets roadworthiness standards. WHS Regulations require a pre-use inspection of plant (including trucks) before each shift, and Chain of Responsibility laws hold every party in the transport chain accountable for vehicle safety.
In the US, FMCSA regulation 49 CFR 396.13 requires drivers to confirm the vehicle is in safe operating condition before driving. Drivers must review the previous DVIR and sign off that reported defects have been repaired.
Penalties for operating an unroadworthy heavy vehicle are severe in both jurisdictions, with fines reaching tens of thousands of dollars and repeat breaches risking suspension of operator accreditation.
Going digital with MapTrack
Paper pre-start books fill up, get lost in the cab or sit unread in the office. MapTrack replaces them with digital pre-start forms that drivers complete on their phone. Each truck carries a QR code label that launches the correct checklist for that vehicle type.
Drivers attach photos of defects using the MapTrack mobile app, giving workshop staff context before opening the bonnet. When a critical defect is flagged, MapTrack's automated alert system notifies the fleet manager and can generate a maintenance work order without manual paperwork.
