Passenger Vehicle Pre-Trip Inspection for CDL

When you carry passengers, the pre-trip inspection isn't just about the vehicle — it's about the lives inside it. A missed brake defect, a faulty emergency exit, or a tire that should have been replaced can turn a routine trip into a disaster. The CDL passenger pre-trip inspection is one of the most detailed inspections in commercial driving, and the skills test examiner will expect you to know it cold. This guide walks you through every step. Practice with our free CDL practice tests.

Section 1: Engine Compartment Inspection

The inspection starts under the hood. Check each of these components:

1. Engine oil: Check the dipstick. Oil should be at the proper level and not contaminated
2. Coolant level: Check the overflow tank or radiator (do not open if hot). Level should be within the marked range
3. Power steering fluid: Check level against the marked range on the reservoir
4. Windshield washer fluid: Check level and top off if needed
5. Belts: Check alternator, water pump, power steering, and air compressor belts for cracks, fraying, or excessive slack (3/4 inch deflection)
6. Hoses: Check all radiator, heater, and power steering hoses for leaks, cracks, or soft spots
7. Battery: Check for secure mounting, clean terminals, no corrosion, and no leaks
8. Engine compartment: Check for oil leaks, coolant leaks, or any unusual odors

Section 2: Vehicle Exterior

Walk around the vehicle in a systematic pattern (typically clockwise from the driver's side front). Check each area:

Driver's Side Front

• Headlights: Both high and low beams functional, lenses clean and not cracked
• Front turn signals: Both functioning, lenses intact
• Clearance lights: All front clearance and identification lights functional
• Windshield: No cracks, chips, or discoloration in the driver's field of vision
• Wipers: Blades intact, move freely, spring tension adequate
• Mirrors: All mirrors (flat, convex, cross-view) securely mounted, clean, and properly adjusted

Driver's Side

• Tires: Minimum 4/32 inch tread depth on front tires, 2/32 on rear. No cuts, bulges, or uneven wear. Proper inflation (check with gauge)
• Wheels/rims: No cracks, missing lug nuts, or rust streaks (indicates loose lugs)
• Springs: No broken or missing leaves, U-bolts secure
• Shock absorbers: No leaks, secure mounting
• Brake drum/disc: No cracks, excessive wear, or oil contamination
• Side marker lights: Functional, lenses intact
• Side reflectors: Present, clean, and properly colored
• Body panels: No loose panels, sharp edges, or damage that could be a hazard

Rear

• Taillights: Functional, lenses clean and not cracked
• Brake lights: Functional — have someone press the brake pedal or check reflection
• Turn signals: Both rear turn signals functional
• Hazard lights: All four corners flashing simultaneously
• Clearance lights: All rear clearance and identification lights functional
• License plate: Present, illuminated, and legible
• Exhaust: Securely mounted, no leaks, tailpipe not damaged

Passenger Side

• Repeat all tire, wheel, spring, shock, brake, and light checks from the driver's side
• Service door: Opens and closes properly, secure when closed, no sharp edges
• Steps: Secure, non-slip surface, handrail solid

Section 3: Passenger Compartment

This is the section that makes passenger vehicle inspection unique. You're checking the area where passengers sit:

1. Driver's seat: Securely mounted, adjusted properly, seatbelt functional
2. Passenger seats: All seats securely mounted to the floor, no broken frames or loose bolts
3. Seatbelts: If equipped, all seatbelts functional, no cuts or fraying, latches work
4. Floor: No holes, loose flooring, or tripping hazards. Floor should be clean and dry
5. Aisles: Clear and unobstructed — minimum aisle width per regulation (typically 12 inches for school buses, 8 inches for transit buses)
6. Interior lights: All dome and aisle lights functional
7. Windows: All windows not cracked, open and close properly if operable
8. Ventilation/heating: Heater and defroster functional, ventilation system working
9. Horn: Functional — both electric and air horn if equipped

Section 4: Emergency Exits

Emergency exits are critical for passenger vehicles. Each exit must be checked from both inside and outside:

• Front door: Opens from inside and outside, operates smoothly, secures properly
• Rear emergency door: Opens from inside and outside. Alarm sounds when door is opened (required on school buses)
• Emergency windows: Each designated emergency window opens from inside and outside. Latches function properly
• Roof hatches: If equipped, open and close properly from inside
• Exit signage: All emergency exit signs visible, legible, and illuminated if required
• Exit aisles: Path to each emergency exit is clear and unobstructed

Section 5: Safety Equipment

The following safety equipment is required on all passenger-carrying commercial vehicles:

• Fire extinguisher: Minimum 5 BC rating (10 BC for school buses). Must be charged, securely mounted, and accessible. Check the inspection tag — must be current
• First aid kit: Required on school buses and some passenger vehicles. Check that it's stocked, sealed, and not expired
• Emergency reflective triangles: Three triangles, undamaged, in a accessible storage location
• Spare fuses: If the vehicle uses fuses (not circuit breakers), a spare for each type used
• Body fluid cleanup kit: Required on school buses in most states
• Flashlight: Recommended — functional with extra batteries

Section 6: Brake System Check

If the passenger vehicle uses air brakes, perform the standard air brake check (same as a truck):

1. Build air pressure to governor cut-out (125–135 PSI)
2. Test low air warning at 55–60 PSI
3. Test spring brake engagement at 20–45 PSI
4. Test air leak rate (hold brake pedal for 1 minute, check pressure drop)
5. Test parking brake

If the vehicle uses hydraulic brakes, check:

• Brake fluid level in the master cylinder reservoir
• Brake pedal feel — firm, not spongy (spongy = air in the lines)
• Parking brake holds the vehicle on a grade
• No brake fluid leaks at wheels or lines

Tips for Passing the Pre-Trip Inspection on the CDL Skills Test

1. Be systematic. Follow the same order every time. The examiner wants to see a methodical, repeatable process — not a random walk around the bus.
2. Say what you're checking and what you're looking for. "Checking the left front tire — tread depth is adequate, no cuts or bulges, proper inflation." The examiner needs to hear what you know.
3. Don't skip anything. Missing a critical item — like emergency exits or the fire extinguisher — can be an automatic failure.
4. Practice the full sequence at least 10 times before your test. You should be able to complete the entire inspection without notes.
5. Check the inside first, then the outside. Some examiners prefer this order because it's logical — start where the passengers are.
6. Know the numbers. Tread depth (4/32 front, 2/32 rear), fire extinguisher rating (5 BC minimum), and other specifications.

For the full general pre-trip guide, read our CDL Pre-Trip Inspection Guide. For air brake specifics, see our CDL Air Brakes Test Guide.

Frequently Asked Questions