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If your business depends on trucks, vans, trailers, or other commercial vehicles, inspections are about more than checking a compliance box. A vehicle that fails a roadside inspection can interrupt deliveries, delay service calls, and put your drivers at risk.

For businesses in southwest Minnesota, the key is understanding how often each inspection is required: and how those inspections fit into a larger maintenance plan.

A commercial DOT inspection is only one part of keeping a fleet road-ready. Annual inspections, daily driver checks, preventive maintenance, and prompt repairs all work together to help your vehicles stay compliant and productive.

Schedule the Annual Inspection Every 12 Months to Avoid Surprises

Under 49 CFR §396.17, each commercial motor vehicle must pass a periodic inspection at least once during the preceding 12 months.

That means the deadline is based on the inspection date: not simply the end of the calendar year. If a truck passes its inspection on May 10, for example, its next inspection is generally due by May 10 of the following year.

The requirement applies to each commercial motor vehicle in your operation. For combination vehicles, that can include the tractor, trailer, dolly, or other separate units, depending on how they are operated and regulated.

A periodic inspection covers major safety systems, including:

• Brakes and brake adjustment
• Steering components
• Suspension systems
• Wheels and tires
• Lighting and reflectors
• Coupling devices
• Fuel and exhaust systems
• Windshield, glass, and wipers
• Frame and chassis components
• Required emergency equipment

The inspection must be completed by a qualified inspector, and documentation of a passing inspection generally needs to be kept on the vehicle. Carriers must also retain inspection reports for the required recordkeeping period.

The practical takeaway is simple: do not wait until the last week before the deadline. Scheduling a commercial DOT inspection several weeks ahead gives your shop time to identify and repair problems before the vehicle’s compliance date arrives.

Complete Pre-Trip and Post-Trip Checks Every Workday

An annual inspection provides a detailed safety review, but it cannot identify every problem that develops during daily use. Commercial vehicles need driver inspections before and after operation as well.

Before leaving, the driver should confirm that the vehicle is in safe operating condition. This usually includes checking the items most likely to affect safe travel:

• Service and parking brakes
• Tires, wheels, and lug nuts
• Headlights, brake lights, turn signals, and reflectors
• Mirrors and windshield visibility
• Steering and suspension
• Coupling equipment
• Emergency equipment
• Fluid leaks or visible damage

At the end of the driving day, the driver should report defects or deficiencies that could affect safe operation or lead to a breakdown. When a defect is reported, the carrier needs to repair it or determine and document that a repair is not necessary before the vehicle returns to service.

These checks do not need to be complicated to be useful. A consistent, documented walk-around can catch a low tire, air leak, damaged light, loose component, or brake concern before it becomes a roadside violation.

The most effective fleet operators make these inspections part of the normal workday. Drivers know what to look for, supervisors review reported issues, and repairs are handled before small concerns become expensive downtime.

Check the Brakes First to Keep Vehicles Moving

Brake problems are among the most serious and common issues found during commercial vehicle inspections. They can result in violations, failed inspections, or an out-of-service order that takes a vehicle off the road immediately.

During a DOT inspection, technicians and inspectors may look for:

• Out-of-adjustment brakes
• Thin or damaged brake linings and pads
• Cracked drums or damaged rotors
• Broken slack adjusters, chambers, hoses, or mounting hardware
• Air leaks in the brake system
• Inoperative service or parking brakes
• Contaminated friction material
• Problems with spring brakes or low-air warning devices

Drivers may notice warning signs before an inspection, including a soft or unusual brake pedal, pulling during braking, grinding noises, longer stopping distances, or an air pressure issue. Any of these symptoms should be reported and checked promptly.

Brake maintenance should be based on vehicle use, mileage, load, route conditions, and inspection findings: not only on a fixed calendar interval. Heavy loads, frequent stops, winter conditions, and rough roads in southwest Minnesota can all increase stress on braking components.

At Slayton Tireworks, our technicians provide brake service and complete automotive repairs for commercial vehicles and fleets. Addressing brake concerns early helps protect drivers, reduce emergency repairs, and keep trucks working when your business needs them.

Watch Tires, Lights, Steering, and Coupling Equipment

Brakes may receive significant attention, but they are not the only systems that can sideline a commercial vehicle.

Tire problems are another frequent source of roadside trouble. Inspectors may identify low tread, improper inflation, exposed cords, sidewall damage, uneven wear, or mismatched tires. Underinflation can also increase heat buildup, reduce fuel efficiency, and shorten tire life.

Fleet tires should be checked regularly for:

• Correct inflation
• Tread depth and even wear
• Cuts, bulges, cracks, or punctures
• Loose or damaged valve stems
• Wheel and lug-nut condition
• Signs of alignment or suspension problems

Lighting defects are easy to overlook but can quickly create compliance problems. A failed marker light, turn signal, clearance lamp, or brake light should be repaired as soon as it is discovered.

Steering and suspension concerns can affect vehicle control and tire wear. Worn tie rods, damaged shocks, loose components, or broken suspension parts may also indicate that a vehicle needs more than a basic inspection.

For trailers and combination vehicles, coupling equipment deserves careful attention. Drivers should check fifth wheels, kingpins, safety devices, air lines, electrical connections, and other attachment points before operation.

Build Fleet Maintenance Around Preventive Service

A fleet maintenance plan should do more than react to failures. It should create a reliable schedule for inspections, service, and repairs based on how your vehicles are used.

Useful preventive steps include:

1. Keep a current inspection deadline for every truck, van, and trailer.
2. Schedule annual inspections before the 12-month deadline.
3. Review driver inspection reports regularly.
4. Repair safety-related defects before vehicles return to service.
5. Track tire condition, brake wear, fluid services, and recurring repairs.
6. Combine routine maintenance with scheduled inspections when practical.
7. Use one reliable service partner for consistent vehicle records and recommendations.

This is where local fleet maintenance services can make a real difference. A shop familiar with your vehicles can spot patterns over time: for example, repeated tire wear, brake issues, suspension damage, or maintenance items that are being deferred.

Preventive maintenance also helps you plan downtime. Instead of discovering a serious problem during a busy delivery week, you can address it during a scheduled service visit.

Partner With a Local Auto Repair Shop for Reliable Support

For a small or midsize business, managing a fleet can be difficult when vehicle maintenance is handled only when something breaks. A dependable local auto repair shop gives your team a place to turn for inspections, diagnostics, tires, brakes, and other repairs.

Slayton Tireworks serves businesses throughout southwest Minnesota with certified DOT inspections, truck and fleet service, tire installation, brake repairs, engine diagnostics, suspension work, and other automotive repairs. Our ASE-certified technicians bring proven experience to every job, while our NAPA Auto Care partnership supports consistent service standards.

We can help you take a practical approach:

• Review the condition of your commercial vehicles
• Identify repairs that may affect inspection results
• Recommend tires based on vehicle use and operating conditions
• Complete brake, suspension, engine, and routine maintenance work
• Help you plan service before compliance deadlines
• Keep your vehicles prepared for the work ahead

A local partner also means less time coordinating between multiple repair providers. You have one team that can become familiar with your vehicles and give straightforward recommendations based on their actual condition.

Keep Your Fleet Compliant and Ready for the Road

Every commercial vehicle should have a current periodic inspection at least every 12 months, but compliance does not end there. Daily driver checks, accurate defect reporting, timely repairs, and preventive maintenance are what help keep vehicles safe between inspections.

Brakes deserve special attention, but tires, lights, steering, suspension, coupling equipment, and documentation all matter too. A missed repair or expired inspection can create unnecessary downtime for your business.

If your company operates commercial vehicles in southwest Minnesota, contact Slayton Tireworks to discuss certified DOT inspections and dependable fleet maintenance services. You can also book an appointment online or call 507-836-8585. We’ll help you keep your vehicles maintained, compliant, and ready to work.