A delivery van is driven over a single road depression. The vehicle's suspension compresses and then continues to bounce up and down repeatedly for several seconds before stabilizing, even though the vehicle sits at the correct factory ride height when stationary. What is the most likely cause of this issue?
- AFatigued suspension leaf springs that have lost their rated load capacity
- BA seized steering knuckle ball joint preventing vertical movement
- Worn hydraulic dampers that can no longer dissipate spring rebound energyCevap
- DSeverely worn rubber jounce bumpers on the lower control arms
Cevap
Worn hydraulic dampers that can no longer dissipate spring rebound energy
The primary role of hydraulic dampers (shock absorbers) is to damp spring oscillation by forcing hydraulic fluid through calibrated valves, converting kinetic energy into thermal energy. When dampers wear out, the vehicle maintains correct static ride height because the springs still support the load, but the chassis will bounce repeatedly after hitting a bump because spring rebound is unrestrained.
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Anahtar Kavram
Functional distinction between suspension springs (load support and ride height) and shock absorbers/dampers (oscillation control)
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