TruckCodex

393.40A-B — Inadequate brakes

FMCSA violation code under Vehicle Maintenance. 3,236 events recorded in roadside inspections. Severity weight: 8.

Severity Weight
8
OOS Eligible
No
BASIC Category
Vehicle Maintenance
Total Events
3,236
Code
393.40A-B
Code System
FMCSR
BASIC Category
Vehicle Maintenance
OOS Eligible
No
Severity Weight
8
Violation Group
—
Total Events
3,236
Carriers Cited
2,265

Violation Description

Commercial motor vehicle equipped with brakes that are inadequate or fail to meet performance requirements.

About This Violation Code

Code 393.40A-B falls under the Vehicle Maintenance BASIC category in FMCSA's Safety Measurement System (SMS). It carries a severity weight of 8 (scale 1-10, higher = more severe).

When this violation is cited during a roadside inspection, it contributes to the carrier's Vehicle Maintenance BASIC score. Carriers with high BASIC percentiles may be prioritized for FMCSA interventions including warning letters, investigations, or compliance reviews.

Regulatory Reference

Federal Motor Carrier Safety Regulations

This violation references 49 CFR 393.40A in the Federal Motor Carrier Safety Regulations.

View on eCFR.gov →FMCSA Violations Search →
Events (all time)
3,236
OOS Events
122
OOS Rate
3.8%
Top State (180d)
California
334 events

Top Enforcing States

Where 393.40A-B is most commonly cited (last 180 days)

1.California
334
OOS 4.2%
2.Pennsylvania
55
OOS 0.0%
3.Florida
54
OOS 0.0%
4.Wisconsin
37
OOS 0.0%
5.Michigan
34
OOS 0.0%
6.Colorado
32
OOS 0.0%
7.Missouri
31
OOS 0.0%
8.Georgia
27
OOS 0.0%
9.New York
25
OOS 0.0%
10.Washington
22
OOS 0.0%
11.Kansas
21
OOS 0.0%
12.Alabama
21
OOS 0.0%
13.Utah
17
OOS 0.0%
14.Ohio
15
OOS 0.0%
15.Tennessee
13
OOS 0.0%

Click a state to see roadside inspection activity, top stations, and carrier profiles in that jurisdiction.

Citation Trend (12 months)

Monthly count of 393.40A-B citations. Red bars mark months with OOS-triggering citations.

92
Apr
197
May
203
Jun
199
Jul
251
Aug
191
Sep
231
Oct
136
Nov
116
Dec
124
Jan
161
Feb
185
Mar
12
Apr

Most Active Stations

Inspection stations citing 393.40A-B most often (last 180 days)

1.DESERT HILLS IF
69
OOS 4.3%
2.OTAY MESA IF
67
OOS 3.0%
3.CALEXICO IF
49
OOS 4.1%
4.CORDELIA IF
31
OOS 0.0%
5.ALACHUA FL
14
OOS 0.0%
6.PA
12
OOS 0.0%
7.CALEXICO EF
11
OOS 9.1%
8.WENTZVILLE MO
10
OOS 0.0%
9.ALBANY GA
10
OOS 0.0%
10.SHAWNEE COUNTY - 177
10
OOS 0.0%

Often Cited Together

Other violations commonly found on the same inspection (last 90 days)

396.3A1-BOS111 co-occurrences396.17C-PI90 co-occurrences392.2-SLLSR75 co-occurrences393.47E74 co-occurrences393.48A-BIHE68 co-occurrences393.53B-B42 co-occurrences392.2-SLLEQP40 co-occurrences393.43D-B39 co-occurrences393.75A3-TAOL31 co-occurrences393.9A-LLPL29 co-occurrences

Citation patterns suggest related root causes (e.g., HOS violations paired with logbook errors).

Top Carriers Cited

Ranked by frequency • 2,265 carriers total • Page 1 of 91

Top Carriers with 393.40A-B Violations

Showing 25 of 2,265

fmcsa-violations
Top Carriers with 393.40A-B Violations
#CarrierUSDOT# Violations
#1SUPLICIUM TRANSPORT LLC438125515
#2BETA AUTO TRANSPORT LLC433397712
#3APEX MATERIALS LLC323985910
#4AMERICAN MOTOR LINES INC17392910
#5TAP UNITED FRIEGHT LLC41494079
#6VALLEY TRANSPORT INC19313789
#7AUTO HAUL EXPRESS LLC43293259
#8BM CARGO INC37601319
#9ASV XPRESS LLC43893018
#10DUSK TO DAWN TRANSPORT CORP42842678
#11HLM XPRESS LLC25843988
#12ALABAMA RAILROAD AND CONSTRUCTION COMPANY LLC15115408
#13CLINT A DAVIS40876788
#14TBINXPRESS LLC23497777
#15SANTOYO TRANSPORT SA LLC14344097
#16H-E EXPRESS LLC40742706
#17DMLCSL LLC44769276
#18BEST CHOICE FL TRANSPORTATION LLC44078786
#19ZEUS FAST TRANSPORT CORP43325706
#20P & R TRANSPORT LLC28968416
#21ACE SOLID WASTE INC10739086
#22GLENN-CORP INC37365126
#23OG TRANSPORTS30939466
#24S&JY SERVICES INC29775476
#25VIZA TRANSPORT LLC42511256

Recent Inspections

Latest inspections where 393.40A-B was cited • 3,236 total events • Page 1 of 130

Recent Inspections with 393.40A-B

Showing 25 of 3,236

fmcsa-inspections
Recent Inspections with 393.40A-B
DateReport #StateLevelOOS
Apr 2, 202687486913MILevel 1No
Apr 2, 202687481259CALevel 1No
Apr 2, 202687476431PALevel 1No
Apr 1, 202687480365CALevel 2No
Apr 1, 202687478134MILevel 1No
Apr 1, 202687470041CALevel 1No
Apr 1, 202687480674CALevel 1No
Mar 31, 202687481793OHLevel 2No
Mar 31, 202687474716FLLevel 1No
Mar 30, 202687457349MOLevel 1No
Mar 30, 202687440609NELevel 1No
Mar 30, 202687452502MSLevel 1No
Mar 30, 202687432944CTLevel 1No
Mar 30, 202687471080CALevel 1No
Mar 30, 202687469421CALevel 1No
Mar 29, 202687444869CALevel 5No
Mar 29, 202687454194WYLevel 1Yes
Mar 28, 202687434511COLevel 1No
Mar 27, 202687425342CALevel 1No
Mar 27, 202687489085CALevel 1No
Mar 27, 202687454067WYLevel 1No
Mar 27, 202687443470CALevel 1Yes
Mar 27, 202687422666PALevel 1No
Mar 27, 202687425341CALevel 1No
Mar 26, 202687426314FLLevel 1No

Data sources & freshness

FMCSA Vehicle Inspections and Violations
Unknown freshness
Federal Motor Carrier Safety Regulations (49 CFR)
Unknown freshness

Related records

CategoryAll Vehicle Maintenance Violations
Browse all violation codes in the Vehicle Maintenance BASIC
IndexAll Violation Codes
FMCSR violation codes by BASIC category
ReferenceFMCSA Roadside Inspections
Inspection levels and procedures
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