FAQs about complementary products Damage evaluation - How can I detect defective complementary products? Worn service kit (left) and new service kit (right). The visual inspection provides information about the components' condition. What are the consequences of defective suspension strut mounts? Defective suspension strut mounts lead to symptoms ranging from loss of exact wheel guidance, insufficient road contact, and imprecise steering behavior to longer stopping distances, noise generation, and vibrations. What are the consequences of defective service kits? Defective service kits lead to premature wear of the shock absorbers. Damage to the piston rod results in shock absorber leakage. What is more, defective service kits lead to overload on the suspension spring and faster wear of the suspension strut mounts. What are the consequences of defective suspension springs? Defective suspension springs result in poor tracking stability. It becomes difficult to control the vehicle. Parts that break off the suspension springs can damage the tires. Moreover, defective suspension springs can lead to varying ride heights on one axle. Finally, noises may occur during spring compression.