Charlotte Mobile Diesel offers DOT inspection prep alongside fleet preventive maintenance, air brake repair, trailer repair and roadside service, helping Charlotte carriers find problems before an inspector does.
Every commercial motor vehicle in interstate commerce needs a periodic inspection at least once every 12 months under 49 CFR §396.17, and the minimum standards are spelled out in Appendix G to Subchapter B. Roadside inspections at the I-85 and I-77 weigh stations use the CVSA out-of-service criteria. Prep work makes sure a truck passes both.
Inspection items that fail most often
Brakes
Out-of-adjustment brakes are consistently among the top roadside violations. Pushrod stroke is measured against the readjustment limit for each chamber type — for example, 2 inches on a standard Type 30 and 2½ inches on a long-stroke Type 30.
Lighting
Inoperative brake lights, turn signals, clearance and ID lamps. LED lamps are long-lived but connector corrosion still takes them out.
Tires
Minimum tread depth is 4/32 inch on steer tires and 2/32 inch on all others, with no exposed cords, bulges or cuts to the belt.
Other common findings
- Air leaks and inoperative low-air warning
- Cracked or loose wheel components and missing lug nuts
- Steering lash and worn tie-rod ends
- Exhaust leaks under the cab
- Fifth-wheel and coupling device wear
- Cracked windshield in the driver's sweep area
How prep visits work
- Tech walks each unit against the Appendix G checklist.
- Defects are documented by unit and location.
- Approved repairs are made on-site where possible.
- Units are ready for the qualified inspector to complete and sign the annual inspection report.
Records and repairs that hold up
Keep the inspection report on file for 14 months and a copy or decal on the vehicle, as the rule requires. Repairs should use DOT-compliant parts — FMVSS 108 lighting, SAE J1402 air brake hose and properly rated slack adjusters. Addressing findings at the same visit keeps a truck from going back out with the defect still on it.