The shock is the component of the suspension that wears out over time like every other part of the car. Observable signs of your car shock issues include:
UP-DOWNWARD CAR MOVEMENT: when you drive and engage your brakes yo notice that your car jumps up and down or swerves. This poses a risk of reduced control of the car.
CAR VIBRATION: a bad shock causes tire miscontact with the road. At high speed the car increases and control of the car almost lost.
CAR SLIDING: when driving your car tends to slide or drift sideways away from your control (drift is always to the side of the affected shock).
WORN OUT TIRE EDGE: because of the uneven tire contact with road, the edge of your tire goes bald. This makes the car veer in the direction of the worn edge.
ROCKING SOUND: your car rattles and rocks when it goes over a bump.