393.45B2

393.45B2 Violation: Brake Hose Chafing or Kinking

Brake tubing or hose was recorded as chafed, kinked, damaged, or inadequately protected.

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Plain-English answer

What does violation code 393.45B2 mean?

Brake tubing or hose was recorded as chafed, kinked, damaged, or inadequately protected.

Why carriers pay attention

How 393.45B2 can affect a trucking safety record

The severity of hose damage depends on location, depth, reinforcement exposure, and applicable out-of-service criteria. A vague repair invoice rarely establishes the original condition.

FMCSA inspection data can flow into the Safety Measurement System used to organize carrier performance into Behavior Analysis and Safety Improvement Categories, commonly called FMCSA SMS BASICs. The carrier should verify the inspection, the assigned BASIC, and whether the violation is included in the official calculation.

How it gets cited

Common 393.45B2 inspection situations

  • A brake hose contacts another component and shows abrasion.

  • A hose bend or routing condition is recorded as a kink that restricts or threatens airflow.

DataQ review

When a 393.45B2 violation may deserve a closer look

A DataQ challenge should identify a specific factual or legal error in the inspection data. These are review questions—not assumptions that the violation should be removed.

Potential review angles

  • The photographed condition does not match the reported damage level or hose location.
  • The cited line is not a brake hose covered by the selected code.
  • The report assigns the condition to the wrong axle, unit, or connection point.

Evidence to collect

  • Close-up photographs showing the entire hose and alleged contact point
  • Technician description of damage depth and reinforcement condition
  • Parts and routing diagrams for the installed brake system
Compliance expert review

Not sure whether 393.45B2 belongs on your record?

We'll review the violation details, identify evidence gaps, and explain whether the facts may support a DataQ challenge.

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DataQs changes in 2026

A stronger review process still requires a stronger record.

FMCSA’s 2026 DataQs overhaul adds independent review stages, decision deadlines, and more detailed explanations. Carriers still carry the burden of identifying the error and supporting the requested correction.

See the 2026 DataQs changes
Frequently asked questions

393.45B2 violation FAQ

What does a 393.45B2 violation mean?

Brake tubing or hose was recorded as chafed, kinked, damaged, or inadequately protected.

Which FMCSA SMS BASIC is associated with 393.45B2?

Code 393.45B2 is commonly associated with the Vehicle Maintenance BASIC in the FMCSA Safety Measurement System. Inclusion and weighting should be confirmed on the carrier’s official record.

Can a trucking company challenge a 393.45B2 violation?

A carrier may submit an FMCSA DataQs Request for Data Review when the underlying inspection data is incomplete or incorrect. A repair made after the inspection does not by itself prove the original 393.45B2 finding was wrong.

What evidence helps review a 393.45B2 violation?

Useful evidence may include close-up photographs showing the entire hose and alleged contact point, technician description of damage depth and reinforcement condition, parts and routing diagrams for the installed brake system. The best evidence is tied to the cited vehicle, driver, location, and inspection time.

Keep reviewing

Related DOT violation codes

View all violation guides
393.47EBrake Out of AdjustmentBrakes393.48AInoperative or Defective BrakesBrakes396.3A1BOS20 Percent or More Defective BrakesBrakes393.9Inoperable Required LampLighting

Source references: 49 CFR 393.45 and FMCSA roadside inspection data. This guide is general information and does not guarantee a DataQs outcome or replace legal advice.