Learn the top out-of-service violations that sideline trucks and trailers at roadside inspections — brakes, tires, lights, and coupling defects — plus how North American Standard Inspections work, OOS time requirements, CSA impact, and pre-trip habits to keep you rolling.
return ( What Does "Out of Service" Mean? An out-of-service (OOS) order means a roadside inspector has found a condition so severe that the vehicle or driver is prohibited from operating until the problem is corrected.
The authority for OOS orders comes from the Commercial Vehicle Safety Alliance (CVSA) , which publishes the North American Standard Out-of-Service Criteria.
These criteria are adopted by every U.S.
state, Canadian province, and Mexican jurisdiction.
When you're placed OOS, you cannot move the vehicle under its own power (except to a safe location if directed by the inspector).
You're stuck — right there, at that weigh station or roadside — until the violation is repaired and verified.
That means lost loads, missed appointments, tow bills, and repair costs on top of the violation itself.
Operating a vehicle after an OOS order has been issued is a federal violation under 49 CFR 396.9(c) .
Penalties can include fines up to $27,894 per occurrence for drivers and $32,208 for carriers.
Your authority can also be suspended for repeat offenses.
The Top OOS Violations by Category CVSA's annual International Roadcheck data consistently shows the same categories dominating OOS violations year after year.
Here are the top offenders for vehicles, ranked by frequency.
Brake Systems — The Perennial Leader Brake violations account for roughly 30-40% of all vehicle OOS conditions every year.
The OOS criteria for brakes are strict: if 20% or more of the service brakes on the vehicle (by wheel count, combining tractor and trailer) are defective or out of adjustment, the entire combination is placed out of service.
Brake adjustment — The single most common OOS violation.
Inspectors measure pushrod stroke using the mark-and-measure method.
Each brake chamber size has a specific stroke limit (e.g., Type 30 long-stroke chambers are OOS at 2.0 inches).
Automatic slack adjusters should maintain proper adjustment, but they can fail — especially if not properly lubricated or if foundation components are worn.
Brake linings/pads — Lining thickness below 1/4 inch, lining cracked through to the backing plate, or lining contaminated with oil or grease.
Riveted linings worn to within 1/16 inch of the rivet head.
Air brake connections — Audible air leaks at glad hands, crimped or chafed air lines, unsecured lines that could contact hot exhaust or moving parts.
A severe air leak that prevents the system from maintaining pressure is an immediate OOS.
Cracked or broken drums/rotors — Any crack that opens upon brake application, or external cracks exceeding 75% of the width of the braking surface.
Missing or broken components — Missing brake shoes, broken return springs, inoperative chambers, missing cotter pins on clevis pins.
Check your trailer brakes before every trip.
Apply the trailer brakes with the hand valve (or have someone press the brake pedal) and crawl under to look at pushrod travel.
If you can see more than about 2 inches of travel on any chamber, th.
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