Following the completion of a daily driving shift, an operator examines vehicle systems to… — Commercial Driver's License (CDL) General Knowledge Exam

Following the completion of a daily driving shift, an operator examines vehicle systems to determine whether any safety defect must be recorded on the official Driver Vehicle Inspection Report (DVIR). Which of the following findings indicates an out-of-tolerance safety defect that requires notation on the report?

A
Drive axle tires possessing $3/32\text{ inch}$ of remaining tread depth across all major grooves
B
Brake slack adjuster pushrod movement of $3/4\text{ inch}$ when pulled firmly by hand with the parking brakes released
Steering axle tires possessing $3/32\text{ inch}$ of remaining tread depth in major groovesCevap
D
Steering assembly free play measuring $1\text{ inch}$ on a standard commercial steering wheel

Cevap

Steering axle tires possessing

3/32\text{ inch}

of remaining tread depth in major grooves

Federal CDL safety regulations require front steering axle tires to have at least

4/32\text{ inch}

of tread depth in every major groove. A measurement of

3/32\text{ inch}

violates this safety standard and must be documented as a defect on the post-trip DVIR so repairs can be made before the vehicle is dispatched again.

Adım Adım Çözüm

Evaluate federal safety standards for tire tread depth across commercial motor vehicle axles.

Steering (front) axle tires mandate at least

4/32\text{ inch}

of tread depth in every major groove, whereas all other tires require at least

2/32\text{ inch}

Steering tires handle directional control and hydroplaning resistance, necessitating stricter tread depth tolerances.

Compare the observed vehicle condition measurements against regulatory safety thresholds.

A steering axle tire with

3/32\text{ inch}

falls below the required

4/32\text{ inch}

minimum, making it a critical safety defect that must be recorded on the post-trip DVIR.

Operating a commercial vehicle with steering tire tread depth below

4/32\text{ inch}

violates safety regulations and constitutes an out-of-service hazard.

Anahtar Kavram

Minimum legal tread depth thresholds and safety defect documentation on post-trip inspection reports

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