Shock absorbers are responsible for keeping tires on the ground and maintaining control of a Volvo over rough roads. Signs of worn shock absorbers include longer stopping distances due to shocks not controlling wheel bounce during braking, nose diving when braking as weight shifts more, and rear squatting when accelerating from shock failure in the rear. Additional signs are leaking shock fluid from broken seals, broken bushings that cannot cushion shock mounts resulting in noise, and broken rubber bushings near shock joints from potholes or impacts. If any of these signs appear, it's advisable to contact a Volvo specialist for inspection.