TruckCodex

393.43A — Brake - relay emergency valve

FMCSA violation code under Vehicle Maintenance. 2,084 events recorded in roadside inspections. Severity weight: 7.

Severity Weight
7
OOS Eligible
No
BASIC Category
Vehicle Maintenance
Total Events
2,084
Code
393.43A
Code System
FMCSR
BASIC Category
Vehicle Maintenance
OOS Eligible
No
Severity Weight
7
Violation Group
—
Total Events
2,084
Carriers Cited
1,622

Violation Description

Relay or emergency valve on CMV is defective or malfunctioning.

About This Violation Code

Code 393.43A falls under the Vehicle Maintenance BASIC category in FMCSA's Safety Measurement System (SMS). It carries a severity weight of 7 (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 393.43A in the Federal Motor Carrier Safety Regulations.

View on eCFR.gov →FMCSA Violations Search →
Events (all time)
2,084
OOS Events
1,664
OOS Rate
79.8%
Top State (180d)
Texas
720 events

Top Enforcing States

Where 393.43A is most commonly cited (last 180 days)

1.Texas
720
OOS 57.4%
2.New Mexico
46
OOS 100.0%
3.Illinois
11
OOS 100.0%
4.Iowa
9
OOS 100.0%
5.North Carolina
7
OOS 85.7%

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

Citation Trend (12 months)

Monthly count of 393.43A citations. Red bars mark months with OOS-triggering citations.

30
Apr
95
May
77
Jun
96
Jul
85
Aug
125
Sep
110
Oct
111
Nov
154
Dec
145
Jan
136
Feb
191
Mar
6
Apr

Most Active Stations

Inspection stations citing 393.43A most often (last 180 days)

1.INDIOS POE
265
OOS 7.9%
2.US281 SB FALFURRIAS SCALE
54
OOS 100.0%
3.US77 RIVIERA SCALE
38
OOS 100.0%
4.COLUMBIA POE
34
OOS 50.0%
5.VETERANS POE
21
OOS 100.0%
6.CARLSBAD PORT OF ENTRY (WHITES
21
OOS 100.0%
7.PHARR POE
14
OOS 100.0%
8.IH-0030 IN DALLAS CO. (32-64)
12
OOS 83.3%
9.NM
8
OOS 100.0%
10.YSLETA POE
8
OOS 100.0%

Often Cited Together

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

393.9211 co-occurrences393.45B2UV140 co-occurrences393.47E130 co-occurrences396.3A1111 co-occurrences393.7893 co-occurrences392.2RG90 co-occurrences396.5B83 co-occurrences393.1172 co-occurrences393.53B69 co-occurrences391.11B2-Z65 co-occurrences

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

Top Carriers Cited

Ranked by frequency • 1,622 carriers total • Page 1 of 65

Top Carriers with 393.43A Violations

Showing 25 of 1,622

fmcsa-violations
Top Carriers with 393.43A Violations
#CarrierUSDOT# Violations
#1TRAREYSA SA DE CV241278621
#2QUALITY TANK SA DE CV286460017
#3TRANSPORTES DE CARGA SAUL SALINAS SA DE CV55767616
#4JOSE EVERARDO CAVAZOS PASSEMENT338820314
#5SERVICIOS ESPECIALIZADOS ALANIS SA DE CV55947713
#6JORGE ANTONIO SEPULVEDA247273912
#7MANTENIMIENTO LIMOSA SA DE CV418230312
#8JOSE ALONSO SARMIENTO TORRES228999212
#9TRANSPORTES REFRIGERADOS GC XPRESS SA DE CV25638039
#10LUCA AUTOTRANSPORTES SA DE CV32104589
#11AUTOTRANSPORTES ROMEDU SA DE CV11482598
#12ROBERTO CARLOS ALVAREZ MARTINEZ32825948
#13MIGUEL ANGEL RUEDA ALVAREZ32656198
#14ANTRIAVI SA DE CV35249077
#15DANIEL EDUARDO GUERRA GARZA33658967
#16CELEDONIO CASTILLO BENAVIDES20308336
#17CRISTIAN MELENDEZ CISNEROS33421595
#18OMAR ALEJANDRO VILLARREAL MORONES29296435
#19GUDELIO GUAJARDO RICHARTE29871615
#20EMETERIO GONZALEZ LOPEZ35526625
#21EDNA LIZETH GARZA ALEGRIA22906625
#22EVANS DELIVERY COMPANY INC381115
#23TRANSPORTE INTERNACIONAL LOPEZ OCHOA SA DE C V10419075
#24RICARDO ALEGRIA HERNANDEZ32493375
#25JAIME MARTINEZ SOLIS33453075

Recent Inspections

Latest inspections where 393.43A was cited • 2,084 total events • Page 1 of 84

Recent Inspections with 393.43A

Showing 25 of 2,084

fmcsa-inspections
Recent Inspections with 393.43A
DateReport #StateLevelOOS
Apr 2, 202687488162TXLevel 2Yes
Apr 2, 202687487734TXLevel 2Yes
Apr 2, 202687487658TXLevel 2Yes
Apr 1, 202687487999TXLevel 2No
Apr 1, 202687487516TXLevel 1No
Apr 1, 202687487053TXLevel 1Yes
Mar 31, 202687479482TXLevel 1Yes
Mar 31, 202687468385TXLevel 1Yes
Mar 31, 202687479336TXLevel 1Yes
Mar 31, 202687468924TXLevel 2No
Mar 31, 202687479793TXLevel 2Yes
Mar 31, 202687479027TXLevel 2Yes
Mar 30, 202687468908TXLevel 2No
Mar 30, 202687468846TXLevel 1No
Mar 30, 202687466878TXLevel 1Yes
Mar 30, 202687468842TXLevel 1No
Mar 30, 202687468042TXLevel 1Yes
Mar 29, 202687442251TXLevel 2Yes
Mar 28, 202687453063IALevel 1Yes
Mar 28, 202687443374TXLevel 1No
Mar 28, 202687443331TXLevel 1No
Mar 28, 202687442960TXLevel 2Yes
Mar 28, 202687443285TXLevel 1No
Mar 27, 202687443264TXLevel 2No
Mar 27, 202687441180TXLevel 2Yes

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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