Like your car's brake system, the steering and suspension system are key safety related systems. Together, they largely determine your car's ride and handling. Have your car's steering and suspension checked regularly, at least once a year and usually with a wheel alignment.
What does it do?
The suspension maintains the relationship between the wheels and the frame. The suspension system interact with the steering system to provide the vehicle control. When working properly, the suspension system helps absorb the energy from road irregularities such as potholes and help maintain vehicle stability. The steering system transmit your input from the steering wheel to the steering gear and other steering components to control the car's direction.
Typical Wear and Tear
Over time, steering and suspension components wear out and
require replacement. Regular checks are critical to maintain a
safe car. Factors that affect wear include:
Symptoms

Key components in your car's suspension and steering include:
Other main parts of the steering and suspension system includes springs, pitman arm and idler arm.