What is Part 393?
The equipment safety rulebook for CMV parts, accessories, and safe operation.
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Part 393 is the equipment safety rulebook for commercial motor vehicles. It covers lights, brakes, tires, steering, suspension, coupling devices, emergency equipment, and cargo securement systems that must be in safe working condition before a CMV is operated.
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The equipment safety rulebook for CMV parts, accessories, and safe operation.
Applies to carriers, drivers, maintenance teams, dispatchers, and intermodal equipment providers.
Covers required lights, reflectors, conspicuity tape, and wiring condition.
Brake and ABS defects are high-risk inspection and out-of-service issues.
Tire, wheel, rim, and hub defects can create blowout, fire, and wheel-end failure risk.
Steering, suspension, frame, and cab/body defects directly affect vehicle control.
Fifth wheel, kingpin, jaws, slider, and air/electrical connections must be secure.
Fire extinguishers, warning devices, and emergency equipment must be ready and usable.
Cargo must be protected against shifting, falling, leaking, spilling, or becoming unstable.
A practical inspection checklist for equipment safety before dispatch and during pre-trip.
Bad equipment can trigger roadside violations even when the driver and dispatch plan are clean.
DispatchHQ helps small carriers organize pre-trip inspection standards, DVIR documentation, maintenance follow-up, driver coaching, trailer defect reporting, and dispatch decisions so unsafe equipment does not become a roadside violation or preventable claim.
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