A failed DOT inspection means downtime, fines, and a black mark on your CSA score. Whether you're a single owner-operator or running a small fleet, a pre-trip and pre-inspection walk-around catches problems before an inspector does. Here's a practical checklist.
Why DOT Inspections Matter
The FMCSA performs Level I, II, and III inspections. Level I (the full 37-step inspection) is the one that puts trucks out of service. Most violations are preventable — brakes, lights, and tires top the list every year.
The Pre-Inspection Walk-Around Checklist
Driver & Paperwork
- [ ] CDL and medical card current
- [ ] Registration and insurance proof on board
- [ ] DOT number displayed and readable
- [ ] Annual inspection report in the cab
- [ ] ELD connected and logging
Brakes (the #1 OOS violation)
- [ ] No air leaks — build pressure and watch the gauge
- [ ] Pushrod stroke within adjustment limits on all chambers
- [ ] Slack adjusters moving freely
- [ ] Drums/rotors not cracked or heat-checked
- [ ] ABS lamp cycles correctly
- [ ] Spring brakes apply and release properly
Lights
- [ ] All headlights, high/low beams working
- [ ] Turn signals front and rear, left and right
- [ ] Brake lights and taillights
- [ ] Clearance and identification lights
- [ ] Hazard/four-way flashers
- [ ] Reverse light
Tires & Wheels
- [ ] Minimum 4/32" tread on steer tires, 2/32" on drives/trailer (but replace well before minimum)
- [ ] No cuts, bulges, or exposed cords
- [ ] No recap on steer axle
- [ ] Wheel nuts present and torqued (no missing/loose)
- [ ] Rims not cracked or bent
Steering & Suspension
- [ ] No play in steering wheel beyond spec
- [ ] Tie rod ends, drag link, Pitman arm secure
- [ ] Air bags/springs not leaking or collapsed
- [ ] No cracked or loose U-bolts
- [ ] Shocks not leaking
Coupling
- [ ] Fifth wheel jaws closed around kingpin
- [ ] Slide lock engaged (if slid)
- [ ] Air and electric lines to trailer connected and undamaged
- [ ] Glad hands seated
- [ ] ABS cord connected
Exhaust & Emissions
- [ ] No exhaust leaks forward of cab
- [ ] DPF not in restricted/clog warning
- [ ] No visible smoke issues
Frame & Body
- [ ] No frame cracks, especially around suspension hangers
- [ ] No loose or missing crossmembers
- [ ] Mud flaps present and not dragging
- [ ] DOT tape/bumper reflective and intact
Keep Good Records
Inspectors love to see documentation. Keep your last annual inspection, all repair receipts, and a driver DVIR for every trip. A paper trail proves you maintain the truck — and it's your best defense in a roadside dispute.
Order a Pre-Purchase Inspection
Buying a truck? Don't take the seller's word for it. BigTruckSales.ai partners with certified commercial inspectors — book an inspection on any listing before you buy and get a full report.
Stay Inspection-Ready
Run this checklist weekly, not just before a trip. Most OOS violations are things a 10-minute walk-around would have caught. Stay ahead and you'll keep your CSA score clean — and your truck earning.