393.43(d) — Brake - relay emergency valve
FMCSA violation code under Vehicle Maintenance. 13,151 events recorded in roadside inspections. Severity weight: 7.
Violation Description
Relay or emergency valve on CMV is defective or malfunctioning.
About This Violation Code
Code 393.43(d) 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.
Top Carriers Cited
Ranked by frequency • 10,950 carriers total • Page 1 of 438
Top Carriers with 393.43(d) Violations
Showing 25 of 10,950
| # | Carrier | USDOT | # Violations |
|---|---|---|---|
| #1 | LBS LOGISTICS INC | 3621068 | 23 |
| #2 | BENNETT TRUCK TRANSPORT LLC | 600382 | 11 |
| #3 | WLLC TRANSPORT INC | 3759529 | 11 |
| #4 | PRIMORIS T AND D SERVICES LLC | 2136090 | 10 |
| #5 | BRIGHTVIEW LANDSCAPES LLC | 362827 | 9 |
| #6 | SUNBELT RENTALS INC | 500579 | 9 |
| #7 | UNITED RENTALS NORTH AMERICA INC | 899748 | 9 |
| #8 | ACME TRUCK LINE INC | 52767 | 9 |
| #9 | CENTRAL VALLEY LAWNSCAPES CONSTRUCTION & MAINTENANCE INC | 3694355 | 8 |
| #10 | YOUNG'S HOT TUB SALES & SERVICE CENTER INC | 2145523 | 8 |
| #11 | JUNIOR'S TREE SERVICE INC | 3383799 | 7 |
| #12 | PHASE 3 COMMUNICATIONS INC | 2739865 | 7 |
| #13 | BRIGHTVIEW COMPANIES LLC | 464076 | 7 |
| #14 | MASTEC NORTH AMERICA INC | 774244 | 7 |
| #15 | GSN INC | 2010636 | 7 |
| #16 | USA DEBUSK LLC | 2297953 | 7 |
| #17 | BUTCH'S RAT HOLE & ANCHOR SERVICE INC | 864564 | 7 |
| #18 | HHS CONSTRUCTION LLC | 1199239 | 6 |
| #19 | BNSF RAILWAY COMPANY | 281683 | 6 |
| #20 | STURGEON ELECTRIC COMPANY INC | 29762 | 6 |
| #21 | RUBEN CARLOS TREVINO SANCHEZ | 1649689 | 6 |
| #22 | TRANSPORT INDIANA LLC | 3057791 | 6 |
| #23 | TBK TRANSPORTATION LLC | 3884002 | 6 |
| #24 | MILLER PIPELINE LLC | 240106 | 6 |
| #25 | CVIN LLC | 3236492 | 6 |
Recent Inspections
Latest inspections where 393.43(d) was cited • 13,151 total events • Page 1 of 527
Recent Inspections with 393.43(d)
Showing 25 of 13,151
| Date | Report # | State | Level | OOS |
|---|---|---|---|---|
| Oct 15, 2024 | 82910441 | OK | Level 1 | Yes |
| Oct 15, 2024 | 82909713 | KY | Level 1 | Yes |
| Oct 15, 2024 | 82909598 | AL | Level 1 | Yes |
| Oct 15, 2024 | 82908664 | MD | Level 1 | Yes |
| Oct 15, 2024 | 82908765 | MD | Level 2 | Yes |
| Oct 15, 2024 | 82907119 | NY | Level 1 | Yes |
| Oct 15, 2024 | 82910471 | OK | Level 1 | Yes |
| Oct 15, 2024 | 82908999 | MD | Level 2 | Yes |
| Oct 15, 2024 | 82911238 | NV | Level 1 | Yes |
| Oct 15, 2024 | 82906938 | NY | Level 1 | Yes |
| Oct 14, 2024 | 82908647 | MD | Level 2 | Yes |
| Oct 14, 2024 | 82908116 | IN | Level 1 | Yes |
| Oct 14, 2024 | 82897947 | SD | Level 1 | Yes |
| Oct 14, 2024 | 82897718 | SC | Level 2 | Yes |
| Oct 14, 2024 | 82913693 | CA | Level 2 | Yes |
| Oct 14, 2024 | 82906506 | DE | Level 2 | Yes |
| Oct 14, 2024 | 82910559 | IA | Level 1 | Yes |
| Oct 14, 2024 | 82908799 | MD | Level 2 | Yes |
| Oct 14, 2024 | 82913742 | CA | Level 1 | Yes |
| Oct 14, 2024 | 82905709 | MO | Level 1 | Yes |
| Oct 14, 2024 | 82899429 | NC | Level 2 | Yes |
| Oct 14, 2024 | 82898288 | MD | Level 2 | Yes |
| Oct 14, 2024 | 82910583 | IA | Level 1 | Yes |
| Oct 14, 2024 | 82898176 | WA | Level 2 | Yes |
| Oct 14, 2024 | 82910926 | KS | Level 1 | Yes |