SUSPENSION
Replacing old shocks and struts can bring back that new car ride you may be missing. Handling and safety increase quite a bit with the improved control that new units provide.
Shocks and struts have the same job: to control suspension movement. The big difference is that a strut is assembled together with other suspension parts, and a shock is a standalone unit. Most modern shocks and struts work by forcing hydraulic fluid inside a tube through valves; this helps control the rebound of the wheel and tire assembly. Without something to control this movement the vehicle would bottom out over even small bumps and be very unstable in turns. Any sudden change in direction could send the vehicle out of control.
Shocks and struts wear out gradually, so you may not even notice when new ones are needed. Be sure to have them checked to ensure a safe, smooth ride.