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Question

Difficulty: HardSuspension Systems

A technician measures a passenger vehicle and finds that the front static ride height is nearly two inches below factory specifications. However, when performing a manual bounce test on the front fenders, the chassis rebounds once and immediately settles without continuous oscillation. Which of the following faults is the primary cause of this problem?

  1. A
    Internal fluid bypass within the front hydraulic telescopic dampers
  2. B
    A disconnected front stabilizer bar and mounting bracket
  3. Fatigued suspension springs that have lost mechanical tension and free heightAnswer
  4. D
    Excessive axial play in the lower control arm ball joints

Answer

Fatigued suspension springs that have lost mechanical tension and free height
The correct answer identifies that suspension springs are responsible for supporting the vehicle's static weight and establishing design ride height. Over extended service, metal fatigue reduces the free height and spring rate of the springs, causing the chassis to sag even when damping units remain in proper working condition.

Step-by-Step Solution

1
Analyze the symptom of reduced static ride height.
Identify that the structural support holding the sprung weight of the vehicle has settled.
Ride height is determined entirely by the elasticity and tension of the vehicle's spring assemblies.
2
Evaluate the result of the manual bounce test.
The chassis settles immediately after one rebound cycle, verifying that damping control is operating normally.
Functional hydraulic dampers dissipate spring energy rapidly, preventing repetitive oscillation.
3
Isolate the defective component based on functional boundaries.
Spring fatigue explains the low ride height while ruling out damper, stabilizer, or linkage failure.
Springs support vehicle mass, whereas dampers only resist dynamic movement.

Key Concept

Functional distinction between load-supporting springs and oscillation-damping units
Estimated Time:1m 15s
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Topics

Suspension Systems

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