What was the immediate drawback of the early solid axle system concerning wheel control over consecutive bumps?

Answer

The heavy unsprung mass caused the entire axle assembly to swing up aggressively, lacking damping to control oscillation

Because the system lacked damping, when a wheel hit a bump, the entire axle assembly swung up aggressively, leading to poor control over subsequent irregularities in the road surface.

What was the immediate drawback of the early solid axle system concerning wheel control over consecutive bumps?

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