No loose, worn, bent, damaged, or missing parts. Condition of spring, spring hangers, shackles, and u-bolts.Use a wrench to test rust-streaked lug nuts, indicating looseness.Condition of the tire-properly inflated, valve stem and cap intact and no serious cuts, bulges, or tread wear.Condition of the wheel and rim-no missing, bent, or broken spacer studs, clamps, lugs, or any signs of misalignment.
Door latches and locks should work properly. Clean all lights, reflectors, and glass as you go along. Turn on the right turn signal, and start the walk-around inspection. Turn on the parking, clearance, side-marker, and identification lights. Turn off the headlights and 4-way emergency flashers. Push the dimmer switch and check that the high beams work. Go to the front of the vehicle and check that the low beams are on and both 4-way flashers are working: Chains (where winter conditions require them).Ĭheck that the safety belt is securely mounted, adjusts, and latches properly, and is not ripped or frayed. Properly charged and rated fire extinguisher. 3 red reflective triangles, 6 fuses, or 3 liquid burning flares. 
Spare electrical fuses (unless the vehicle has circuit breakers).Inspect mirrors and windshield for cracks, dirt, illegal stickers, or other obstructions to seeing clearly. Parking, clearance, identification, marker switch(es). Inter-axle differential lock (if the vehicle has one).Retarder controls (if the vehicle has them). Trailer brake (if the vehicle has one). Oil, coolant, charging circuit warning, and ABS lights should go out right away.Ĭheck all of the following for looseness, sticking, damage, or improper setting: Should begin gradual rise to normal operating range.
Build the air pressure to governor cut-out (usually around 120–140 psi.) Know your vehicle’s requirements. Pressure should build from 50 – 90 pounds per square inch (psi) within 3 minutes. Pressure should come up to normal within seconds after the engine is started. For trailers only, if the yellow light on the left rear of the trailer stays on, the ABS is not working properly. If it stays on, the ABS is not working properly. The light on the dash should come on and then turn off.
If equipped, check the anti-lock braking system (ABS) indicator lights. Start engine and listen for unusual noises. Put the gearshift in Neutral (or “Park” if automatic). Step 3: Start the Engine and Inspect the Inside the Cab Get in and Start the Engine Warning devices for parked vehicles (for example, 3 red reflective warning triangles, 6 fuses, or 3 liquid burning flares). Spare electrical fuses (unless equipped with circuit breakers). Vehicles must be equipped with emergency equipment. Exhaust system parts rubbing against fuel system parts, tires, or other moving parts of the vehicle. Loose, broken, or missing mounting brackets, clamps, bolts, or nuts. Loose, broken, or missing exhaust pipes, mufflers, tailpipes, or vertical stacks. Any loose, cracked, broken, or missing frame members.Ī broken exhaust system can let poison fumes into the cab or sleeper berth. Air suspension systems that are damaged and/or leaking. Torque rods or arms, u-bolts, spring hangers, or other axle positioning parts that are cracked, damaged, or missing. Broken leaves in a multi-leaf spring or leaves that have shifted so they might hit a tire or other part. If 1/4 or more are missing, it will put the vehicle “out-of-service,” but any defect could be dangerous. Missing or broken leaves in any leaf spring. Spring hangers hat allow movement of an axle from its proper position. Therefore, broken suspension parts can be extremely dangerous. The suspension system holds up the vehicle and its load and keeps the axles in place.
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