FMCSR 393.48(b) – Brakes Out of Adjustment: Citations & Enforcement

No. Across our inspection records, 393.48(b) citations have resulted in zero out-of-service placements. While the violation is OOS-eligible under FMCSA rules, the 0.0% out-of-service rate in our all-time database shows that enforcement officers rarely invoke that authority for this specific code.

This doesn't mean you can ignore it—but you have time to schedule repairs rather than being pulled off the road immediately.

A single 393.48(b) citation carries a CSA severity weight of 7 points. In the Vehicle Maintenance BASIC, your points accumulate over a rolling 24-month period and are multiplied by 1.0 in the first 30 days, then decay.

One citation alone won't trigger intervention, but multiple brake-related violations within your safety record will compound. The severity weight reflects that brake adjustment is considered a moderate-risk defect.

1. Document the inspection report – Get a copy from the officer or your carrier immediately.
2. Schedule a qualified mechanic – Brake adjustment must meet FMCSA limits; use a certified shop.
3. Request re-inspection – Many jurisdictions allow a courtesy re-check after repair at no penalty.
4. Report to your carrier/safety manager – Flag it in your CSA record so your fleet can track it.
5. Keep repair receipts – You may need proof of correction if disputing through DataQs.
6. Check for related codes – Review the full inspection report for companion violations like 393.47E (slack adjuster defects).

In the context of brake and vehicle maintenance violations, 393.48(b) sits in the middle. Our inspection data shows that 393.47E (slack adjuster defects) has been cited 180,363 times with a 0.0% out-of-service rate—the same profile as 393.48(b).

However, wider vehicle maintenance codes like 396.3(a)(1) generate 236,919 citations and a 45.3% out-of-service rate. The low enforcement volume on 393.48(b) suggests it's either well-maintained across the fleet or less commonly detected than related defects.

Yes. DataQs is the FMCSA's online portal for contesting roadside inspection records. For 393.48(b), you can challenge the citation if:

• The inspection was procedurally flawed (officer didn't follow inspection protocol).
• The measurement or adjustment reading was incorrect (if you have repair documentation showing compliance).
• The violation was misclassified (e.g., recorded as out-of-adjustment when it wasn't).

Submit your dispute within 90 days of the inspection with supporting repair records or witness statements. Documentation-based errors are more contestable than subjective equipment findings.

CSA violations remain in your record for 24 months from the citation date. During that time, the citation contributes to your Vehicle Maintenance BASIC score and may influence carrier hiring, insurance rates, or audit priority.

After 24 months, the citation drops off your rolling safety window. However, the inspection record itself stays in the FMCSA database permanently for historical purposes. Clean driving behavior and no repeat violations will naturally improve your standing over time.

Our inspection records show zero citations for 393.48(b) in the last 12 months and all-time. This is striking compared to peer codes: 393.47E (slack adjuster defects) has 180,363 citations, and 393.9(a) (inoperable required lamps) has 660,737.

Possible reasons: inspectors may be citing related slack adjuster codes instead of the adjustment code, brake maintenance practices have improved fleet-wide, or the defect is harder to detect without full brake system testing. Regardless, the zero-citation trend suggests either strong compliance or detection gaps.

Yes. Your citation is tied to you, the driver, not to your employer. It appears on your official FMCSA CSA record and your Driver Safety Performance data, which all carriers can see during hiring checks.

Carriers receive your Vehicle Maintenance BASIC score, which accumulates all maintenance-related violations including 393.48(b). A new carrier will see the violation when they pull your DAC (Driver Applicant Checking) report or FMCSA safety profile. A clean safety record is a competitive advantage when changing jobs.