Vehicle Inspection
What this domain tests
Vehicle Inspection tests the pre-trip, en-route, and post-trip checks, including tires, lights, fluids, belts, hoses, couplings, emergency equipment, and the air brake test sequence.
Core rules
- Do a systematic pre-trip inspection: engine compartment, walk-around, lights, tires, brakes, coupling, and cargo.
- Check tire tread: at least 4/32 inch on front steer tires and 2/32 inch on other tires. Look for cuts, bulges, and proper inflation.
- Test lights, reflectors, mirrors, wipers, horn, and emergency equipment.
- Check belts and hoses for cracks, fraying, and leaks. Check fluid levels.
- For air brakes, perform the build-up, leak, low-pressure warning, and spring brake tests.
- Check coupling devices, safety latches, air lines, and electrical cords. Recheck cargo securement.
- Report defects and do not drive an unsafe vehicle.
Worked example
A front steer tire has 3/32 inch tread. The minimum is 4/32 inch, so the vehicle fails inspection even though 3/32 inch would be acceptable on a rear tire. The driver should not “balance” the tire or move it to another position; a steer tire below the limit is a defect. The rest of the inspection still needs to be completed so all defects are documented.
Traps that cost marks
Using the 2/32-inch limit for steer tires; skipping the air brake leak test; checking only one side of the vehicle; missing a slack adjuster or air leak; and signing off a vehicle with an unrepaired defect.