Violation code

393.45DLUV

Brake Connections with Leaks Under Vehicle

Vehicle Maintenance4Non-OOS· SMS Appendix A v3.20

393.45DLUV is a Brakes, All Others violation under 49 CFR §393.45DLUV. It falls in the Vehicle Maintenance BASIC with a severity weight of 4/10. Nationally it was cited 63,280 times in the last five years, with an OOS rate of 3.7%.

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National roadside inspection stats

as of 6/20/2026

Inspections

59,038

that found this code

Violations

63,280

total written

OOS rate

3.7%

2,326 OOS

Source: FMCSA roadside inspection data (last 5 years). The OOS rate is the share of these violations that led the officer to mark the driver or vehicle out of service.

Violation group: Brakes, All Others
Regulation §: 393.45DLUV
Severity weight: 4
Used in SMS: Yes
Status: Active
Updated: 6/20/2026

Last updated June 2026

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Notes

DSMS: Y

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Challenging 393.45DLUV through FMCSA DataQs

If this violation was written incorrectly, here are the angles trucking-safety managers use to contest it. Playbook: Vehicle Maintenance (general).

Relevant 49 CFR49 CFR § 393.45

Brake tubing and hose; adequacy

“All brake tubing and hose must: be designed and constructed in a manner that ensures proper, adequate, and continued braking action; be installed in a manner that prevents chafing, kinking, or other mechanical damage; be installed in a manner that prevents undue heating from contact with the vehicle's exhaust system.”

Common ways to challenge this code

Pre-trip inspection showed compliant brakes
The driver's pre-trip DVIR documented compliant brake adjustment and operation. The cited defect arose en route or was misclassified at roadside.
Evidence that wins
- ✓Driver Vehicle Inspection Report (DVIR) from that date
- ✓Repair invoice or shop record
- ✓Post-citation re-inspection certificate (clean)
Momentary failure exception (§393.9)
The required lamp was inoperative only momentarily due to vibration, temperature, or similar transient cause — explicitly exempted under §393.9.
Evidence that wins
- ✓Photograph showing the lamp operable before / after the stop
- ✓Repair invoice if a fuse or bulb was replaced
Tread measurement disputed
The tread depth measurement was taken at a worn point that is not representative, contrary to NHTSA/FMCSA measurement standards.
Evidence that wins
- ✓Independent tread gauge reading from same tire (multiple positions)
- ✓Photograph of the tire with a reference scale
Documented maintenance schedule disproves the defect
Carrier's periodic-inspection records show the cited defect could not reasonably have existed at the time of inspection.
Evidence that wins
- ✓Periodic inspection certificate (§396.17)
- ✓Maintenance work order proximate to inspection date

Common pitfalls — avoid these

⚠DataQs cannot remove a violation simply because the defect was repaired after the stop

⚡ Draft a challenge for 393.45DLUV →Read the DataQs guide first

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Frequently asked questions about 393.45DLUV

What does violation 393.45DLUV mean?

393.45DLUV is the FMCSA roadside-inspection violation code for "Brake Connections with Leaks Under Vehicle", part of the Brakes, All Others group, cited under 49 CFR §393.45DLUV.

What BASIC does 393.45DLUV affect?

393.45DLUV falls under the Vehicle Maintenance BASIC in the FMCSA Safety Measurement System (SMS).

What is the CSA severity weight of 393.45DLUV?

393.45DLUV carries a severity weight of 4 out of 10. Higher weights indicate violations more closely tied to crash risk, and they count more toward a carrier's Vehicle Maintenance score.

Is 393.45DLUV an out-of-service (OOS) violation?

No. 393.45DLUV is not an out-of-service violation, so on its own it does not trigger an out-of-service order at the roadside.

How many CSA points does 393.45DLUV add to a carrier's score?

The point contribution of 393.45DLUV depends on its severity weight (4/10) multiplied by a time weight of 3, 2, or 1 based on how recent the inspection is. You can calculate the exact contribution with the CSA points calculator.

Can 393.45DLUV be challenged through DataQs?

Yes. If you believe 393.45DLUV was recorded in error, you can file a Request for Data Review (RDR) through the FMCSA DataQs system with supporting evidence. A successful challenge can remove or correct the violation on your record.

Keep going

CSA points calculator How to challenge a violation Draft a DataQs letter for 393.45DLUV Vehicle Maintenance BASIC Carrier CSA lookup CSA glossary

393.45DLUV

National roadside inspection stats

Challenging 393.45DLUV through FMCSA DataQs

Pre-trip inspection showed compliant brakes

Momentary failure exception (§393.9)

Tread measurement disputed

Documented maintenance schedule disproves the defect