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Difficulty: EasySuspension System Inspection

A commercial driver is performing a pre-trip inspection of a truck's rear suspension assembly. Which observation indicates a hazardous defect that makes the vehicle unsafe to drive?

  1. A
    Slight surface rust on the exterior curved surface of an intact spring hanger bracket
  2. B
    Dry road dust accumulated on the lower cylinder housing of a shock absorber with no signs of fluid leakage
  3. A spring leaf that has shifted sideways out of position and could strike a tireAnswer
  4. D
    Torque rod rubber bushings that are firmly seated in their brackets without gaps or free play

Answer

A spring leaf that has shifted sideways out of position and could strike a tire.
During a pre-trip inspection, commercial drivers must check leaf springs for missing leaves, cracks, and sideways movement. Any leaf that has shifted out of place and could strike or rub against a tire, brake component, or the frame is a severe safety hazard that requires immediate correction before driving.

Step-by-Step Solution

1
Inspect the leaf spring pack for alignment, cracked leaves, and clearance.
Identify any leaf that has moved or shifted from its central alignment.
Leaves must remain straight and centered to keep the axle aligned and prevent dangerous rubbing against tires.
2
Evaluate the safety hazard of the identified condition against commercial vehicle safety standards.
A shifted spring leaf that can hit a tire or other moving component poses an immediate risk of a catastrophic tire blowout.
CDL pre-trip inspection regulations strictly prohibit driving with shifted leaves that threaten adjacent components.

Key Concept

Suspension safety standards require checking for cracked, broken, or shifted leaf springs that could contact tires or other components.
Estimated Time:45s
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Topics

Suspension System Inspection

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