When should I replace my shocks and struts? They should be replaced between 50,000-100,000 miles and this depends on your specific car, pickup, van, or suv. These are a maintenance item and they are also a safety item. When your shocks and struts are worn they can prevent you from stopping as quickly in a hard braking situation. They wear slowly so it's hard to know when they are worn out. When they are replaced you'll notice that your vehicle rides so much nicer.