Examkin

Question

Difficulty: MediumTires, Wheels, and Rims Inspection

During a commercial motor vehicle pre-trip inspection, rust streaks radiating outward from the wheel lug nuts or shiny metal visible around the stud holes indicate that the lug fasteners may be loose.

Answer: Answer

Answer

The statement is True.
Under CDL safety and pre-trip inspection standards, rust streaks around wheel nuts are a classic visual indicator of looseness caused by water entering the gap and carrying rust outward during wheel rotation. Similarly, shiny metal or polished surfaces around bolt holes and studs signify direct metal-to-metal rubbing from loose, vibrating fasteners.

Step-by-Step Solution

1
Identify the wheel and rim inspection criteria for mounting hardware on a commercial vehicle.
CDL pre-trip inspection guidelines specify checking all wheel lugs, studs, and mounting surfaces for signs of failure or looseness.
Loose wheel fasteners pose an immediate risk of wheel separation and catastrophic loss of vehicle control.
2
Evaluate the physical meaning of rust trails radiating from lug nuts and shiny metal around studs.
Rust streaking indicates moisture penetration and metal fretting between a loose nut and rim, while shiny, polished metal indicates active friction from loose hardware shifting during travel.
These physical symptoms provide clear visual evidence that the fasteners are not maintaining proper clamping force.
3
Determine the validity of the statement based on CDL regulatory standards.
The statement accurately reflects the required pre-trip inspection protocol.
Drivers must recognize these visual warnings to take corrective action before operating the vehicle.

Key Concept

Visual Indicators of Loose Wheel Fasteners and Rim Hardware
Estimated Time:1m 0s
Rate this question

Topics

Tires, Wheels, and Rims Inspection

More questions from this topic