CDL Pre‑Trip Inspection Manual

A comprehensive guide for CDL drivers to ensure vehicle safety and DOT compliance

⚠️ Important CDL Requirements

Federal Motor Carrier Safety Regulations (49 CFR 396.13) require drivers to inspect their vehicles before each trip. This inspection must be thorough and systematic. Failure to conduct proper pre-trip inspections can result in fines, out-of-service orders, and CDL suspension.

Step 1: Document Review & In-Cab Inspection

  • Verify CDL license is current with proper endorsements.
  • Check medical examiner's certificate expiration date.
  • Review previous Driver Vehicle Inspection Report (DVIR).
  • Ensure registration, insurance, and permits are current.
  • Test all gauges and warning lights with key on.
  • Check horn, windshield wipers, and heater/defroster operation.
  • Adjust mirrors and seat for proper driving position.
  • Verify emergency equipment: fire extinguisher, triangles, spare fuses.

Step 2: Engine Compartment Check

  • Check engine oil level - should be between MIN and MAX marks.
  • Inspect coolant level in reservoir (when engine is cold).
  • Verify power steering fluid at proper level.
  • Check windshield washer fluid reservoir.
  • Inspect belts for proper tension and signs of wear.
  • Check all hoses for leaks, cracks, or soft spots.
  • Ensure battery connections are clean and secure.
  • Look for any signs of leaks under the vehicle.

Step 3: Air Brake System Tests (CDL Required)

  • Build air pressure to 100+ PSI (should take less than 3 minutes).
  • Test air leakage rate - max 3 PSI/minute with brakes released.
  • Apply service brakes - leakage should not exceed 4 PSI/minute.
  • Check low air warning device - should activate at 55-75 PSI.
  • Test spring brakes - should engage between 20-45 PSI.
  • Verify governor cut-out pressure between 120-140 PSI.
  • Check brake adjustment using proper PPE and procedures.
  • Test service brakes and parking brake for proper hold.

Step 4: External Walk-Around Inspection

  • Start at driver's side of cab, walk counter-clockwise.
  • Check all lights: headlights, turn signals, markers, reflectors.
  • Inspect windshield for cracks in driver's line of sight.
  • Verify license plates are clean, visible, and current.
  • Check fuel tank(s) secure with no leaks, cap tight.
  • Inspect exhaust system for damage or loose parts.
  • Check frame and cross members for cracks or damage.
  • Verify mud flaps are present and not damaged.

Step 5: Wheel, Tire & Suspension Inspection

  • Check tire pressure using gauge (not thumper).
  • Verify tread depth: minimum 4/32" on steer, 2/32" on others.
  • Look for cuts, bulges, or tread separation on all tires.
  • Ensure valve stems have caps and are not damaged.
  • Check all lug nuts are present and show no rust streaks.
  • Inspect wheels/rims for cracks, especially around lug holes.
  • Verify springs/air bags are not broken, shifted, or leaking.
  • Check shock absorbers for leaks and secure mounting.

Step 6: Coupling System (Combination Vehicles)

  • Verify fifth wheel is properly greased and locked.
  • Check that jaws are closed around kingpin.
  • Ensure no space between upper and lower fifth wheel.
  • Test locking mechanism - pull handle should not move.
  • Check air lines and electrical cord properly connected.
  • Verify glad hands are sealed and not leaking.
  • Ensure trailer height is correct (not too high or low).
  • Check safety chains/cables if equipped.

Step 7: Cargo Securement Check

  • Verify cargo doors are securely latched.
  • Check load is properly distributed and balanced.
  • Ensure cargo is secured per DOT requirements.
  • Count tie-downs: minimum requirements based on length/weight.
  • Inspect straps, chains, and binders for damage.
  • Verify no cargo extends beyond legal limits.
  • Check placards match hazardous materials (if applicable).
  • Ensure tarps or covers are secure if required.

Step 8: Final Checks & Documentation

  • Start engine and verify all gauges read normal.
  • Test service brakes at 5 mph before entering traffic.
  • Check mirrors and clean if necessary.
  • Complete Driver Vehicle Inspection Report (DVIR).
  • Note any defects found and report to maintenance.
  • Sign and date the inspection report.
  • Keep copy of DVIR in vehicle as required.
  • Review route and weather conditions before departure.

📋 CDL Holder Responsibility

As a CDL holder, you are personally responsible for the safe operation of your vehicle. Never operate a commercial vehicle with defects that would make it unsafe or likely to break down. When in doubt, don't drive out!

Use Checklist Online