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Difficulty: MediumSuspension System Inspection

During a commercial driver vehicle inspection, an operator must inspect distinct suspension components for specific signs of wear, damage, and critical safety defects. Match each suspension component on the left with its corresponding inspection defect indicator on the right.

  • Leaf spring assemblyFractured or missing individual spring layers, or shifted plates that may contact a tire
  • Spring hanger bracketCracked, broken, or unbolted frame-attachment casting that anchors the suspension to the chassis
  • Torque rod (radius rod)Severely worn, missing, or rotted rubber bushings causing axle misalignment during braking
  • Air suspension bellows (air spring)Audible air leaks, ruptured rubber bladder, or deflated state causing uneven chassis height

Answer

Leaf spring assembly matches with fractured or missing individual spring layers; Spring hanger bracket matches with cracked, broken, or unbolted frame-attachment casting; Torque rod matches with severely worn, missing, or rotted rubber bushings; Air suspension bellows matches with audible air leaks, ruptured rubber bladder, or deflated state.
Each suspension component has a distinct mechanical design and associated failure mode: leaf springs crack or shift across individual leaves; spring hangers fracture at frame mounting points; torque rods experience bushing wear that misaligns the axle; and air bags suffer punctures or air leaks that deflate the suspension.

Step-by-Step Solution

1
Identify the primary failure modes of leaf spring assemblies.
Leaf springs consist of stacked steel plates susceptible to cracking, missing leaves, and shifting that can rub against wheels or brake lines.
Ensures load-bearing capacity and tire clearance are maintained.
2
Examine the role and failure symptoms of the spring hanger bracket.
The hanger is the structural mounting point directly bolted or welded to the chassis frame.
A cracked hanger allows the entire spring pack and axle to detach or shift out of position.
3
Determine the inspection check specific to torque rods (radius rods).
Torque rods position the axle fore-and-aft and rely on rubber/polyurethane bushings at each pivot end.
Worn or missing bushings cause severe axle wandering and braking instability.
4
Identify defect indicators for air ride suspension bellows.
Air bags rely on airtight flexible bladders that fail via dry rot, punctures, or fitting leaks leading to deflation.
Deflation causes bottoming out and uneven frame height.

Key Concept

Suspension system component identification and critical defect recognition during commercial vehicle pre-trip inspection.
Estimated Time:1m 15s
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Topics

Suspension System Inspection

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