Abstract: At least one adjustable drive unit for a wheel support which can be set in oscillation, and electronic units which measure and evaluate the oscillating movement of the suspended vehicle with the following process steps:Acceleration of the wheel support by the drive unit to an oscillation measurement point A in an oscillation range above the resonance frequency of the wheel, and maintenance of the wheel support in this oscillating condition, until at measurement point B, the wheel has matched the oscillations of the wheel support with sufficient accuracy;A delayed reduction of the oscillation frequency with simultaneous measurement and storage of the oscillation amplitude to a reverse oscillation frequency at measurement point C, at which, during the reduction of the oscillation frequency, the oscillation amplitude has fallen below a first limit value which is considered an indicator of the faded, or decayed, resonance frequency;An increase in the oscillation frequency with simultaneous measurement and storage