Spring is in the air. The snow is melting, the birds are back, and somewhere across the country, over-worked inspectors are dusting off their clipboards and getting ready for Roadcheck 2026.
For most people, this time of year signals a fresh start. For fleets, it is the annual reminder that every slightly questionable brake, tire, or cracked light that made it through the winter is about to have a very official conversation about it.
Here Comes the Judge
With CVSA's International Roadcheck less than a month away, most of the conversation has settled around two topics this year: ELD tampering and cargo securement.
Inspectors will be cross-referencing driver logs against toll records and fuel receipts, and cargo securement continues to generate a significant volume of citations every year. If you follow industry coverage, it is easy to come away thinking that this is where all the risk sits.
Only Part Of The Picture
Despite all the scrutiny on these two focus areas, we're still pretty sure vehicle maintenance will continue to be the dubious leader in causing of out-of-service orders. Turns out a burned-out brake lamp or a tire that has worn just past the legal limit can end the inspection the same way a falsified log would.
A Level I inspection is a full, methodical review of the vehicle itself, and it does not slow down because there is a paperwork conversation happening in parallel. Inspectors are moving through brakes, tires, lights, steering components, suspension, and everything else that determines whether that truck is safe to operate.
The fleets that perform well during Roadcheck tend to understand this intuitively. They do not ignore the annual focus areas, but they also do not let them pull attention away from the underlying mechanical condition of the fleet, which has been driving 22% out-of-service rates and is one of the worst, open secrets in the industry.
There is a more useful way to think about this. Roadcheck does not find bad trucks. It finds bad habits. The violations that put vehicles out of service in May are almost never the result of something going wrong at the wrong time. They are the predictable output of maintenance decisions, or more correctly, the absence of them, made weeks and months earlier.
Brake linings do not wear below spec overnight. Tires do not develop sidewall damage between the yard and the weigh station. Lights do not burn out the morning of an inspection. By the time an inspector finds these things, they have been accumulating quietly for a while. What Roadcheck does do is it makes the record official.
The Usual Suspects
If you look at the data over time, the same systems come up year after year. Brakes, tires, and lights account for the overwhelming majority of vehicle out-of-service orders every Roadcheck cycle, not because fleets are unaware of them, but because the habits that produce those violations are baked into how maintenance gets prioritized and deferred. That consistency is itself the point. These are not unpredictable failures or unlucky timing. They are the systems that reveal what a maintenance program looks like when the pressure is off and what it looks like when an inspector applies it again.
Stop Right There
Brake system defects are consistently the largest contributor to vehicle out-of-service orders during Roadcheck, often accounting for roughly a quarter of all cases.
What matters here is the depth of the inspection. Inspectors are not just checking for obvious defects. They are measuring push-rod stroke, verifying slack adjuster function, and closely examining drums, rotors, linings, hoses, and air lines. It is a detailed process that surfaces issues that would not necessarily be caught in a quick pre-trip.
The failures themselves are familiar. Brake linings that have worn below minimum thickness, cracked or heat-damaged drums, air leaks that have developed slowly over time, or adjusters that are no longer functioning as intended. None of these are unusual, but they are exactly the kinds of issues that accumulate when inspections are spaced out or inconsistently executed.
For fleets, the implication is straightforward. This is less about reacting to recent DVIRs and more about proactively auditing the braking system across the fleet in the weeks leading up to Roadcheck. A brake failure during inspection is not bad luck. It is the end of a longer story.
On Thin Tread
Tire-related violations remain among the most common reasons vehicles are placed out of service, even though they are some of the most visible and, in theory, the easiest to manage.
Inspectors are looking at tread depth, structural integrity, and mounting hardware. A steer tire approaching the legal minimum is likely to draw immediate attention, particularly given its direct impact on vehicle control. Sidewall damage, exposed cords, or mismatched tires across an axle are similarly straightforward to identify.
What tends to cause issues in practice is not a lack of awareness, but the gradual nature of tire wear. On high-mileage equipment, especially in regional operations like garbage trucks for example, uneven wear patterns can develop in ways that are not immediately obvious until they cross a threshold. By the time the vehicle is inspected, the margin is already gone. This is the result of skipped rotations, deferred replacements, or position checks that happened on a schedule designed for convenience rather than condition. This is one of those areas where a more deliberate, position-by-position review ahead of Roadcheck pays off far more than relying on routine checks alone.
Lights Out
Lighting violations are among the most frequently cited during Roadcheck, which is notable given how easy they are to detect and correct.
The issues that show up are usually really straightforward. Burned-out lamps, damaged trailer lights, worn reflective tape, or intermittent wiring problems at the tractor-trailer connection are all common. What is notable is not the difficulty of fixing these problems, but how often they go unaddressed.
Inspectors will check every required lamp on both the tractor and trailer, including brake lights, turn signals, marker lights, and clearance lights, along with the condition of conspicuity tape and the integrity of the wiring connection between units.
A simple two-person walk-around, with one individual cycling through all lighting functions while another observes from the outside, will catch the majority of these issues. Yet it is still common to see fleets arrive at Roadcheck with lighting defects that should have been resolved in minutes. Of all the habits that Roadcheck exposes, this one is the hardest to explain away.
Spring Fever
Steering and suspension violations are less frequent than brakes or tires, but when they do appear, they tend to be more serious. Inspectors are evaluating steering play, component wear, and mounting integrity, along with any leaks that could affect system performance. On the suspension side, they are looking for structural issues such as cracked spring leaves, missing hardware, or air system leaks.
These are not always issues that drivers can easily identify during a pre-trip, particularly if they develop gradually. As a result, they are more likely to surface during a thorough shop inspection than through driver-reported defects. That gap, between what a driver notices and what a shop finds, is itself a habit. Fleets that rely on driver-reported defects as their primary signal for steering and suspension work are running a maintenance program that is structurally behind the problem.
The Weakest Link
Fifth wheel and coupling system issues tend to receive less attention, but they can result in immediate failures during a walk-around inspection. Inspectors will verify that the locking mechanism is properly engaged, assess the condition of the kingpin, and check for any visible wear or structural damage. Even something as simple as incomplete engagement of the locking jaws can lead to an out-of-service determination.
While drivers are expected to perform tug tests, the inspector's verification is more direct. If coupling checks are not consistently included in preventive maintenance routines, this is an area where issues often go unnoticed. Coupling components degrade slowly and quietly, which makes them easy to defer and easy to miss until a formal inspection makes the deferral visible.
Blowing Smoke
Fuel system leaks and exhaust routing problems are another category that often goes underreported in day-to-day operations. Inspectors will cite leaks, missing caps, or exhaust configurations that could allow fumes to enter the cab. In some cases, exhaust leaks near fuel or electrical components can elevate the severity of the violation.
These issues often develop gradually and may not be obvious to drivers, particularly on diesel equipment where some level of vapor is expected. That expectation is part of the problem. When minor fuel seeps and exhaust irregularities are treated as normal background conditions rather than developing defects, they rarely make it onto a DVIR. A targeted visual inspection ahead of Roadcheck is usually sufficient to identify and resolve them. However, the habit worth building is doing that inspection year-round, not just in May.
The Sum of Its Parts
The final category is broader and more subjective, but it is often where inspectors identify patterns of deferred maintenance. Cracked frame components, unsecured battery boxes, damaged air tanks, or other signs of wear that have been noted but not addressed tend to fall into this bucket. Individually, these issues may not seem urgent, but collectively they signal a vehicle that has not been kept up to standard.
Experienced inspectors are particularly attuned to this, and it often influences how closely the rest of the vehicle is examined.
End the Scramble
Roadcheck lasts 72 hours, but the violations it surfaces can follow a carrier for the better part of a year through CSA scores, insurance renewals, and conversations with shippers who check safety ratings before they hand over a load.
The fleets that come through cleanest are rarely the ones who scrambled in that final week. They are the ones who treat mechanical condition as a standing priority rather than a seasonal one. For them, Roadcheck is not an audit to prepare for. It is a confirmation of work already done.
That distinction matters because it reframes what preparation actually means. The point is not to get the fleet ready for three days in May. It is to run a maintenance program where three days in May is never the thing you are preparing for. Pull forward overdue PMs. Work through the open DVIR items that have been sitting. Take a deliberate pass through brakes, lighting, and the systems that do not announce themselves until an inspector is standing next to them.
The goal is not to pass Roadcheck. The goal is to build the habits that make passing it a foregone conclusion.
Axle Mobility is building the system of execution for fleet repair and maintenance, so techs, fleet managers and fleet executives can focus on trucks, not mindless admin.