Leakage and possible causes If the damper seems to be leaking, it does not necessarily have to be so. A certain amount of "sweating" is normal and even required for lubricating the piston rod seal. Never assess the damper after driving in the rain; the dampers should be dry. Noise and possible causes Noise during spring compression does not necessarily come from defective dampers. Therefore, check:Axle suspensionStabilizer rubbersCapsand, of course, check whether the noise is caused by objects in the trunk. Rubber joints worn and torn Rubber joints worn and torn Origin:Normal wear due to high mileage.Wear due to sand (abrasive effect).Wear due to driving with ride height too high or incorrectly adjusted air spring level setting.Result:Noises (rattling, knocking) Thread impressions in bushing Thread impressions in bush Origin:Insufficient tightening torque.Result:Play between bushing and thread crests. Damage - Impact damage If the damper is damaged, this was caused by force - through an accident or an installation error.Therefore, check:Damage on axles and damper anchoragePerform wheel alignment. Go to useful tip "Impact damage at shocks and dampers"