These parts are designed to control the tires, to keep them in contact with the road surface as much as possible. If vehicle tires are free to bounce (which is what happens when struts and shocks wear) they are not as effective at gripping the road, so steering, handling, and braking are all affected. Shocks and struts are not just for ride comfort: their primary function, tire control, is a much more important role.
Because the wear of these components is mostly internal and cannot be seen like worn tires or brake pads, and because it is very gradual, the everyday driver is the last to notice the difference. But, regardless of how it may feel, worn struts and shocks will cause a change in tire wear and vehicle handling that should not go unaddressed. Replacing these worn components will restore the ride control and handling the vehicle demonstrated when it was new. It also means longer tire wear. New shocks and struts also help reduce potential wear of other steering or suspension components.Remember, too, that whenever the struts are replaced, it becomes important to check the alignment, as it may have changed, to protect your vehicle tires and assure maximum safety.