Violation code

393.47

Inadequate brake lining for safe stopping

Not in SMSNon-OOS· FMCSA A&I All Violations

393.47 is a Vehicle violation under 49 CFR §393.47. It is not scored in the SMS. Nationally it was cited 4 times in the last five years, with an OOS rate of 0.0%.

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National roadside inspection stats

as of 9/20/2026

Inspections

that found this code

Violations

total written

OOS rate

0.0%

0 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.

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Not used in SMS BASIC scoring

Recorded on your inspection report and visible on the PSP, but contributes 0 points to CSA BASIC scores — even if cited Out-of-Service.

Violation group: Vehicle
Regulation §: 393.47
Severity weight: N/A
Used in SMS: No
Status: Active
Updated: 9/20/2026

Last updated September 2026

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What 393.47 means — and how to avoid it

In plain English

In plain terms, 393.47 is cited for inadequate brake lining for safe stopping. It falls under the FMCSA rules on parts and accessories needed for safe operation.

What the inspector checks

•Brake adjustment and pushrod stroke within limits
•Air loss/leaks, low-air warning, and reservoir pressure
•Cracked, worn, or contaminated linings, drums, and rotors
•Hoses/tubing chafing, kinked, or leaking

How to prevent it

✓Check brake adjustment and listen for air leaks at every pre-trip
✓Fix air leaks and warning-light faults before dispatch — don’t “drive it in”
✓Put brakes on the PM schedule and document the work

How it affects your CSA

0 CSA points

393.47 is not scored in the SMS. It adds 0 CSA points — even if written out-of-service — but it still appears on the inspection report and the driver’s PSP.

General guidance from the violation’s FMCSA classification — not legal advice, and not a substitute for the inspector’s findings or 49 CFR.

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Challenging 393.47 through FMCSA DataQs

If this violation was written incorrectly, here are the angles trucking-safety managers use to contest it. Playbook: Codes not used in SMS scoring.

Relevant 49 CFR49 CFR § 393.47

Brake actuators, slack adjusters, linings/pads, and drums or rotors

“Each commercial motor vehicle must meet the applicable requirements for brake actuators, slack adjusters, brake linings/pads, and brake drums or rotors of this section, except as provided in paragraph (a)(2) of this section.”

Common ways to challenge this code

Not used in SMS — should not affect BASIC
This code is on the inspection report but is excluded from SMS BASIC scoring per Appendix A. Use DataQs to correct the underlying data quality issue if the code was written in error, but understand it does not affect the CSA percentile.
Evidence that wins
- ✓FMCSA SMS Methodology Appendix A reference
- ✓Underlying inspection report

Common pitfalls — avoid these

⚠These codes still appear on PSP — challenge the data if the cite was wrong

⚡ Draft a challenge for 393.47 →Read the DataQs guide first

Other Vehicle codes

Codes under the same FMCSA violation group

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Frequently asked questions about 393.47

What does violation 393.47 mean?

393.47 is the FMCSA roadside-inspection violation code for "Inadequate brake lining for safe stopping", part of the Vehicle group, cited under 49 CFR §393.47.

What BASIC does 393.47 affect?

393.47 is not scored in any CSA BASIC. It is recorded on the inspection report and appears on the PSP, but it contributes 0 points to a carrier's SMS BASIC percentiles.

Is 393.47 an out-of-service (OOS) violation?

No. 393.47 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 393.47 add?

393.47 adds 0 CSA points because it is not used in SMS scoring, even when written out of service.

How can a driver prevent 393.47?

Check brake adjustment and listen for air leaks at every pre-trip; Fix air leaks and warning-light faults before dispatch — don’t “drive it in”; Put brakes on the PM schedule and document the work.

Can 393.47 be challenged through DataQs?

Yes. If you believe 393.47 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 393.47 Carrier CSA lookup CSA glossary

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