TruckCodex

393.43(b) — Brake - relay emergency valve

FMCSA violation code under Vehicle Maintenance. 280 events recorded in roadside inspections. Severity weight: 7.

Severity Weight
7
OOS Eligible
No
BASIC Category
Vehicle Maintenance
Total Events
280
Code
393.43(b)
Code System
FMCSR
BASIC Category
Vehicle Maintenance
OOS Eligible
No
Severity Weight
7
Violation Group
—
Total Events
280
Carriers Cited
168

Violation Description

Relay or emergency valve on CMV is defective or malfunctioning.

About This Violation Code

Code 393.43(b) 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 393.43 in the Federal Motor Carrier Safety Regulations.

View on eCFR.gov →FMCSA Violations Search →
Events (all time)
280
OOS Events
0
OOS Rate
0.0%
Top State (180d)
—

Top Carriers Cited

Ranked by frequency • 168 carriers total • Page 1 of 7

Top Carriers with 393.43(b) Violations

Showing 25 of 168

fmcsa-violations
Top Carriers with 393.43(b) Violations
#CarrierUSDOT# Violations
#1AUTOTRANSPORTES ROMEDU SA DE CV114825912
#2CLAUDIA BELINDA ANDARZA LEAL9634359
#3AUTOTRANSPORTES FRONTERIZOS MG SA DE CV17705346
#4JUAN JOSE SAENZ RAMIREZ30429056
#5TRANSPORTE INTERNACIONAL LOPEZ OCHOA SA DE C V10419076
#6JESUS VALADEZ15116686
#7AUTO EXPRESS SALDIVAR SA DE CV6535355
#8TCF TRANSPORTATION GROUP SA DE CV41490025
#9ALMA LUZ SANTOS SALDIVAR18060715
#10RUBEN CARLOS TREVINO SANCHEZ16496894
#11JOSE ALONSO SARMIENTO TORRES22899924
#12AUTOLINEAS SIGIFREDO GARCIA PALACIOS SA DE CV10860054
#13CRUCES INTERNACIONALES NISSI S DE R L DE C V36941334
#14TRANSPORTES MUZBEL SA DE CV29572663
#15TRANSPORTES MARYJOSE SA DE CV23871583
#16AUTOTRANSPORTES DAST SA DE CV10684713
#17JOSE YOUNG ALADRO CHIO32174673
#18INTERNACIONAL DE CARGA RS SA DE CV28138233
#19JUAN PABLO GARCIA CHAVEZ21708563
#20JOSE SAUL RIVERA MANCINAS18515793
#21OTD FREIGHT S DE RL DE CV35367873
#22EDUARDO JEU SILVA CAPISTRAN41034103
#23TRANSPORTES REFRIGERADOS GC XPRESS SA DE CV25638033
#24ALDO GRACIEL BELLO DEL ANGEL28598623
#25RS TRANSFER SA DE CV11568252

Recent Inspections

Latest inspections where 393.43(b) was cited • 280 total events • Page 1 of 12

Recent Inspections with 393.43(b)

Showing 25 of 280

fmcsa-inspections
Recent Inspections with 393.43(b)
DateReport #StateLevelOOS
Oct 14, 202482904822USLevel 1No
Oct 11, 202482894198USLevel 1No
Oct 10, 202482876666USLevel 1No
Oct 10, 202482894883WILevel 2No
Oct 10, 202482876721USLevel 1No
Oct 10, 202482905859GALevel 1No
Oct 9, 202482890020CALevel 1No
Oct 8, 202482907778USLevel 1No
Oct 8, 202482856069USLevel 1No
Oct 8, 202482907780USLevel 1No
Oct 8, 202482856053USLevel 1No
Oct 7, 202482852887USLevel 1No
Oct 7, 202482852944USLevel 1No
Oct 7, 202482852992USLevel 1No
Oct 7, 202482852993USLevel 1No
Oct 7, 202482907121USLevel 1No
Oct 6, 202482842384USLevel 1No
Oct 3, 202482830440USLevel 1No
Oct 3, 202482823310USLevel 1No
Oct 3, 202482823596USLevel 1No
Oct 3, 202482830443USLevel 1No
Oct 2, 202482865267USLevel 1No
Oct 2, 202482819686USLevel 1No
Oct 2, 202482819720USLevel 1No
Oct 2, 202482837364CALevel 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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