TruckCodex

393.43(a) — Brake - relay emergency valve

FMCSA violation code under Vehicle Maintenance. 4,045 events recorded in roadside inspections. Severity weight: 7.

Severity Weight
7
OOS Eligible
No
BASIC Category
Vehicle Maintenance
Total Events
4,045
Code
393.43(a)
Code System
FMCSR
BASIC Category
Vehicle Maintenance
OOS Eligible
No
Severity Weight
7
Violation Group
—
Total Events
4,045
Carriers Cited
3,555

Violation Description

Relay or emergency valve on CMV is defective or malfunctioning.

About This Violation Code

Code 393.43(a) 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)
4,045
OOS Events
3,815
OOS Rate
94.3%
Top State (180d)
—

Top Carriers Cited

Ranked by frequency • 3,555 carriers total • Page 1 of 143

Top Carriers with 393.43(a) Violations

Showing 25 of 3,555

fmcsa-violations
Top Carriers with 393.43(a) Violations
#CarrierUSDOT# Violations
#1EVANS DELIVERY COMPANY INC3811116
#2LUCA AUTOTRANSPORTES SA DE CV32104589
#3XPO LOGISTICS FREIGHT INC2418298
#4KAREN YISELL PAZ SALINAS35368098
#5JESUS MA VALDEZ GARCIA25347847
#6CRST EXPEDITED INC537737
#7ESTES EXPRESS LINES1210187
#8J B HUNT TRANSPORT INC808066
#9TRANSPORTES REFRIGERADOS GC XPRESS SA DE CV25638036
#10AUTOFLETES GOMEZ LEAL SA DE CV20853086
#11TRANSPORTES UNIDOS CASTANEDA SAPI DE CV7804076
#12MR BULT'S INC3871025
#13ERMELANDO HERNANDEZ FERNANDEZ15936865
#14US XPRESS INC3030245
#15SIERRA PACIFIC INDUSTRIES5181105
#16TRANSPORTES CANALES S A DE C V5588995
#17STG DRAYAGE LLC6881435
#18CONTAINERPORT GROUP INC2327344
#19TRANSPORTES BRAVO SA DE CV19417424
#20RODRIGO ARREOLA SALAZAR6389114
#21BLAIR LOGISTICS LLC19410864
#22FREIGHT SOLUTIONS LLC21491614
#23FLETES Y ACARREOS DE REYNOSA SA DE CV8515744
#24RTS HOLDINGS LLC23653084
#25RUBEN CARLOS TREVINO SANCHEZ16496894

Recent Inspections

Latest inspections where 393.43(a) was cited • 4,045 total events • Page 1 of 162

Recent Inspections with 393.43(a)

Showing 25 of 4,045

fmcsa-inspections
Recent Inspections with 393.43(a)
DateReport #StateLevelOOS
Oct 15, 202482910127NCLevel 1Yes
Oct 15, 202482909805KYLevel 1Yes
Oct 15, 202482907675SCLevel 1Yes
Oct 14, 202482905736AKLevel 2Yes
Oct 14, 202482906894USLevel 1Yes
Oct 14, 202482897891UTLevel 1Yes
Oct 14, 202482897863UTLevel 1Yes
Oct 12, 202482895515USLevel 1Yes
Oct 11, 202482904803NYLevel 2Yes
Oct 11, 202482905631GALevel 1Yes
Oct 11, 202482897216WILevel 1Yes
Oct 10, 202482902695CALevel 1No
Oct 10, 202482895519WILevel 1Yes
Oct 10, 202482887555NMLevel 1Yes
Oct 10, 202482880530MILevel 1Yes
Oct 10, 202482902159CALevel 1No
Oct 10, 202482880479MILevel 1Yes
Oct 9, 202482873245USLevel 1Yes
Oct 9, 202482892155OHLevel 1Yes
Oct 9, 202482912756TXLevel 2Yes
Oct 9, 202482911796TXLevel 1Yes
Oct 9, 202482889151TXLevel 1Yes
Oct 9, 202482912379TXLevel 2Yes
Oct 9, 202482873261USLevel 1Yes
Oct 9, 202482901608TXLevel 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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