393.42(a) — Brakes - parking brake defective

FMCSA violation code under Vehicle Maintenance. 652 events recorded in roadside inspections. Severity weight: 6.

Severity Weight
6
OOS Eligible
No
BASIC Category
Vehicle Maintenance
Total Events
652
Code
393.42(a)
Code System
FMCSR
BASIC Category
OOS Eligible
No
Severity Weight
6
Violation Group
Total Events
652
Carriers Cited
448

Violation Description

Commercial motor vehicle parking brake system is not adequate to hold the vehicle stationary.

About This Violation Code

Code 393.42(a) falls under the Vehicle Maintenance BASIC category in FMCSA's Safety Measurement System (SMS). It carries a severity weight of 6 (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 393.42 in the Federal Motor Carrier Safety Regulations.

Events (all time)
652
OOS Events
196
OOS Rate
30.1%
Top State (180d)

Top Carriers Cited

Ranked by frequency • 448 carriers total • Page 1 of 18

Top Carriers with 393.42(a) Violations

Showing 25 of 448

fmcsa-violations

Recent Inspections

Latest inspections where 393.42(a) was cited • 652 total events • Page 1 of 27

Recent Inspections with 393.42(a)

Showing 25 of 652

fmcsa-inspections
Recent Inspections with 393.42(a)
DateReport #StateLevelOOS
Oct 15, 202482910441OKLevel 1No
Oct 11, 202482885314SCLevel 1No
Oct 11, 202482886793MDLevel 2Yes
Oct 9, 202482906076NYLevel 2No
Oct 8, 202482884312WILevel 1No
Oct 8, 202482875325TNLevel 2Yes
Oct 8, 202482862579NYLevel 1No
Oct 7, 202482849034NVLevel 2Yes
Oct 3, 202482833846MALevel 1Yes
Oct 3, 202482846089MALevel 1No
Oct 3, 202482840185COLevel 1No
Oct 1, 202482826749MILevel 1No
Oct 1, 202482813090OHLevel 1No
Sep 30, 202482801539USLevel 1Yes
Sep 30, 202482799653USLevel 1No
Sep 27, 202482831728MNLevel 2No
Sep 27, 202482831495MNLevel 1No
Sep 27, 202482833733COLevel 1No
Sep 26, 202482764894UTLevel 1Yes
Sep 25, 202482774204TNLevel 1No
Sep 25, 202482767786KSLevel 1Yes
Sep 24, 202482778958OHLevel 1Yes
Sep 23, 202482763284WILevel 1No
Sep 23, 202482801771USLevel 1No
Sep 23, 202482751246TNLevel 1No

Data sources & freshness

FMCSA Vehicle Inspections and Violations
Unknown freshness
Federal Motor Carrier Safety Regulations (49 CFR)
Unknown freshness