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Question

Difficulty: EasySuspension Systems

A driver notices that a vehicle continues to bounce up and down excessively several times after driving over a single bump in the road. Which suspension component has most likely failed and requires replacement?

  1. A
    Coil springs
  2. Shock absorbersAnswer
  3. C
    Sway bar end links
  4. D
    Upper ball joints

Answer

Shock absorbers
Shock absorbers (or struts) contain hydraulic fluid and valving designed to resist rapid movement and dampen spring rebound. When internal seals leak or valving wears out, the shock absorber loses hydraulic resistance, allowing the springs to bounce freely until energy naturally dissipates.

Step-by-Step Solution

1
Analyze the observed vehicle symptom
Uncontrolled, repeated vertical bouncing after hitting a road irregularity
Identifying the symptom isolates the failure to a damping defect rather than a structural support or steering alignment problem.
2
Correlate the failure mode with component function
Shock absorbers provide velocity-sensitive fluid resistance to dampen spring oscillation.
While springs store and release impact energy, shock absorbers convert the kinetic energy of spring motion into thermal energy, quickly stabilizing the chassis.

Key Concept

Damping of spring oscillations by shock absorbers
Estimated Time:45s
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Topics

Suspension Systems

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