What Keeps Your Vehicle Stable?

Quick facts

  • One worn shock absorber can increase stopping distance by as much as 23 percent.
  • Worn shocks and struts accelerate tire wear and suspension component wear.
  • Shocks and struts should be inspected at minimum once per year.
  • Struts are structural components that also support the vehicle's weight, unlike shocks.

The shocks and struts on your vehicle play a big role in the stability and control of the vehicle. The vehicle being stable means that it has the ability to stop, turn, and swerve at exactly the moment you need it to. Your shocks and struts are designed to react to every wheel and body movement, and also to every bump and corner. They also help to keep the vehicle at the proper ride height that the vehicle was designed to have. They keep the geometry of the suspension in the correct position.

Shocks and struts that are wearing will allow the vehicle to dip, sway, bounce and overreact to corners, during stopping and acceleration, and over bumps or uneven surfaces on the road. These effects result in reduced braking ability, along with tire and suspension parts having accelerated wear. It is also more difficult for the driver to maintain control of the vehicle, causing them to constantly make steering corrections while driving to compensate.

Studies show that it only takes one worn shock to increase your vehicle's stopping distance. When you are braking, a worn shock will cause the front of the vehicle to nose dive. This makes the rear end of the vehicle rise and causes the tires to lose their firm grip of the road. This poor traction increases the stopping distance of your vehicle. Some studies show that it can be increased by as much as 23%.

If your shocks or struts are getting worn this can be indicated by the following symptoms:

  • Nose dives during hard braking
  • Vehicle squatting during acceleration
  • Excessive body roll around corners
  • Extended bounce time over bumps or dips in pavement
  • Bottoming out
  • Tire cupping

If you are experiencing any of these symptoms we recommend having your trusted repair facility perform an inspection. At minimum your shocks and struts should be inspected on a yearly basis. Having your shocks and struts replaced when they show signs of being worn will help to keep your vehicle responsive and safe. This will help to keep the ride and handling of your vehicle like new.

Frequently asked questions

Common questions

What is the difference between a shock absorber and a strut?

A shock absorber is a standalone damping component that controls spring movement but does not bear vehicle weight. A strut combines a shock absorber with a structural housing that is part of the suspension assembly. It bears the weight of the vehicle and determines the wheel's position and alignment angles. Replacing a strut is a more involved job than replacing a shock because it affects alignment.

How do I know if my shocks or struts need replacing rather than just an alignment?

Alignment problems typically show up as pulling to one side or uneven tire wear, without the dynamic handling symptoms. Worn shocks and struts produce bouncing after bumps, body sway in corners, nose-diving under braking, and a floating or loose feel at highway speeds. Both issues can coexist, but the handling characteristics you experience while driving usually point to which system is the primary problem.

Do all four shocks or struts need to be replaced at the same time?

Industry best practice is to replace shocks and struts in axle pairs, both front units together, or both rear units together. Replacing only one side creates an imbalance in handling and braking. The vehicle will pull toward the stiffer side under braking and lean toward the worn side in corners, which can actually worsen handling compared to leaving both worn units in place.

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