TruckCodex

396.3A1-BOS — BRAKES OUT OF SERVICE: The number of defective brakes is equal to or greater than 20 percent of the service brakes on the vehicle or combination

FMCSA violation code under Vehicle Maintenance. 61,053 events recorded in roadside inspections. Severity weight: N/A.

Severity Weight
N/A
OOS Eligible
No
BASIC Category
Vehicle Maintenance
Total Events
61,053
Code
396.3A1-BOS
Code System
FMCSR
BASIC Category
Vehicle Maintenance
OOS Eligible
No
Severity Weight
N/A
Violation Group
—
Total Events
61,053
Carriers Cited
40,078

Violation Description

BRAKES OUT OF SERVICE: The number of defective brakes is equal to or greater than 20 percent of the service brakes on the vehicle or combination

About This Violation Code

Code 396.3A1-BOS falls under the Vehicle Maintenance BASIC category in FMCSA's Safety Measurement System (SMS).

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 396.3A1 in the Federal Motor Carrier Safety Regulations.

View on eCFR.gov →FMCSA Violations Search →
Events (all time)
61,053
OOS Events
60,511
OOS Rate
99.1%
Top State (180d)
California
3,849 events

Top Enforcing States

Where 396.3A1-BOS is most commonly cited (last 180 days)

1.California
3,849
OOS 99.3%
2.US
1,407
OOS 100.0%
3.Tennessee
839
OOS 100.0%
4.Missouri
718
OOS 100.0%
5.Kentucky
608
OOS 99.8%
6.Pennsylvania
592
OOS 100.0%
7.New York
535
OOS 100.0%
8.Utah
509
OOS 100.0%
9.Maryland
468
OOS 100.0%
10.Arizona
440
OOS 100.0%
11.New Jersey
413
OOS 100.0%
12.Florida
378
OOS 100.0%
13.Arkansas
363
OOS 100.0%
14.Washington
362
OOS 100.0%
15.Oklahoma
359
OOS 99.7%

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

Citation Trend (12 months)

Monthly count of 396.3A1-BOS citations. Red bars mark months with OOS-triggering citations.

1,831
Apr
3,639
May
3,082
Jun
3,726
Jul
4,242
Aug
3,608
Sep
4,010
Oct
2,921
Nov
2,560
Dec
2,848
Jan
2,756
Feb
3,395
Mar
174
Apr

Most Active Stations

Inspection stations citing 396.3A1-BOS most often (last 180 days)

1.DESERT HILLS IF
331
OOS 98.8%
2.LAREDO TX
315
OOS 100.0%
3.OTAY MESA IF
283
OOS 100.0%
4.LONDON
249
OOS 100.0%
5.MOHAWK TN
248
OOS 100.0%
6.DUNSMUIR GRADE IF
240
OOS 100.0%
7.NJ
230
OOS 100.0%
8.EL PASO TX
223
OOS 100.0%
9.PHARR TX
214
OOS 100.0%
10.ARDMORE TN
195
OOS 100.0%

Often Cited Together

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

393.47E8,750 co-occurrences393.53B-B4,297 co-occurrences393.48A-BIHE2,516 co-occurrences393.48A-BIBD1,698 co-occurrences396.17C-PI1,376 co-occurrences393.75A3-TAOL1,225 co-occurrences396.3A1-BALAC1,200 co-occurrences393.45D-B1,024 co-occurrences393.45B2-B-AIR984 co-occurrences392.2-SLLSR892 co-occurrences

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

Top Carriers Cited

Ranked by frequency • 40,078 carriers total • Page 1 of 1604

Top Carriers with 396.3A1-BOS Violations

Showing 25 of 40,078

fmcsa-violations
Top Carriers with 396.3A1-BOS Violations
#CarrierUSDOT# Violations
#1EVANS DELIVERY COMPANY INC3811194
#2WESTERN EXPRESS INC51141292
#3VRP TRANSPORTES DE MEXICO S DE RL DE CV66205886
#4J B HUNT TRANSPORT INC8080678
#5SERVICIO INTERNACIONAL DE ENLACE TERRESTRE SA DE CV81817576
#6SWIFT TRANSPORTATION CO OF ARIZONA LLC5428367
#7FEDERAL EXPRESS CORPORATION8687665
#8AUTO HAUL EXPRESS LLC432932555
#9UNITED PARCEL SERVICE INC2180050
#10TRANSPORTADORA NORTE DE CHIHUAHUA S A DE C V71112549
#11SERVICIO DE TRANSPORTE INTERNACIONAL Y LOCAL SA DE CV55734146
#12SCHNEIDER NATIONAL CARRIERS INC26418444
#13SUPLICIUM TRANSPORT LLC438125544
#14TWIN CARRIER LLC351873543
#15TRYTIME TRANSPORT LLC199466442
#16MARISOL ALONSO RIOS393387542
#17OPERADORA DE TRANSPORTE INTERNACIONAL SA DE CV68342840
#18BELTRAN BROTHERS LLC112203939
#19SAKARA LLC442953037
#20TRANSPORTES AGUILA DE CIUDAD JUAREZ SA DE CV55536536
#21KNIGHT TRANSPORTATION INC42882336
#22TRANSPORTATION AND CARGO SOLUTIONS S DE RL DE CV77997336
#23RGX TRANSPORTE DE CARGA INTERNACIONAL SA DE CV120767835
#24LINEA AMERICA TRANSPORTE S DE RL DE CV324004334
#25CONTAINERPORT GROUP INC23273433

Recent Inspections

Latest inspections where 396.3A1-BOS was cited • 61,053 total events • Page 1 of 2443

Recent Inspections with 396.3A1-BOS

Showing 25 of 61,053

fmcsa-inspections
Recent Inspections with 396.3A1-BOS
DateReport #StateLevelOOS
Apr 3, 202687484484NYLevel 1Yes
Apr 3, 202687485656MALevel 1Yes
Apr 3, 202687488764CALevel 1Yes
Apr 3, 202687485090USLevel 1Yes
Apr 3, 202687485105USLevel 1Yes
Apr 3, 202687485244MOLevel 1Yes
Apr 3, 202687485748KYLevel 1Yes
Apr 3, 202687485641MALevel 5Yes
Apr 3, 202687488804CALevel 5Yes
Apr 2, 202687485636MOLevel 1Yes
Apr 2, 202687489453CALevel 1Yes
Apr 2, 202687488564CALevel 1Yes
Apr 2, 202687488458CALevel 1Yes
Apr 2, 202687486862MILevel 1Yes
Apr 2, 202687486851MILevel 1Yes
Apr 2, 202687485811KYLevel 1Yes
Apr 2, 202687485492USLevel 1Yes
Apr 2, 202687485491USLevel 1Yes
Apr 2, 202687485489USLevel 1Yes
Apr 2, 202687485411ARLevel 2Yes
Apr 2, 202687485126USLevel 1Yes
Apr 2, 202687484784USLevel 1Yes
Apr 2, 202687484743USLevel 1Yes
Apr 2, 202687484730USLevel 1Yes
Apr 2, 202687484725MDLevel 1Yes

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
ToolSearch Carriers
Look up carriers by USDOT, name, or VIN