Shocks and struts both control how a vehicle absorbs bumps, but they are not the same part. A shock is a standalone damping component. A strut combines that same damping function with a spring and structural support built into one assembly. Knowing which one your car uses and which one is worn, changes both the diagnosis and the repair.
We check for this distinction every week across our Pickering and Etobicoke bays, since it affects the parts we order and what the repair actually costs you. Here is how we tell shocks and struts apart and what each one is doing under your car right now.
What Shocks Do
A shock absorber controls how fast your springs compress and rebound after hitting a bump. A piston pushes against hydraulic fluid inside the shock and that resistance slows the spring down. This helps to settle down your car instead of bouncing repeatedly. Shocks mount separately from the spring between the frame and a suspension arm or axle.
Shocks do not bear the weight of the vehicle. Their only job is managing motion which is why a worn shock tends to show up as excess bounce rather than a change in ride height.
What Struts Do
A strut does everything a shock does. It also acts as a structural part of the suspension. The coil spring wraps around the strut body and the whole assembly replaces the upper control arm found in more traditional suspension setups. That makes struts weight bearing and it means they influence alignment too, since they help hold the wheel in position as it steers and turns.
Most front wheel drive vehicles use struts up front and shocks in the rear. Some vehicles use struts on all four corners and it is rare though not impossible to find a car built with shocks only.
Shocks vs Struts: The Main Differences
| Aspect | Shocks | Struts |
| Structural role | Standalone, not weight bearing | Weight bearing, part of the suspension frame |
| Includes the spring | No, spring is separate | Yes, spring is built into the assembly |
| Affects alignment | Rarely | Yes, since it holds the wheel position |
| Common location | Rear axle on many vehicles | Front axle on most vehicles |
| Replacement | Can often be done individually | Typically requires spring compression tools |
Signs You Need Shocks or Struts Replaced
Excess bouncing – Worn shocks or struts are usually the reason if your car keeps bobbing after a bump instead of settling quickly.
Nose diving under braking – A noticeable dip at the front of the car when you brake hard often points to worn struts up front.
Uneven or cupped tire wear – Tires that bounce instead of staying flat on the road wear unevenly, sometimes in a scalloped pattern.
Fluid leaking from the unit – A visible leak on the shock or strut body means the seal has failed and it needs replacing.
Clunking or knocking over bumps – This can point to a worn strut mount or bushing in addition to the shock or strut itself.
Why the Difference Matters for Your Repair Bill
Struts generally cost more to replace than shocks, mainly because of the labor involved. A shock absorber can often be unbolted and swapped without much extra work. A strut assembly usually needs the coil spring compressed and released safely which takes specialized tools and more time on the lift. That is also why getting the terminology right matters when you are comparing quotes between shops, since a quote for shocks and a quote for struts are rarely apples to apples.
Getting Them Fixed at Supreme Lube
We inspect shocks and struts as part of our suspension checks at both our Pickering and Etobicoke locations, no appointment needed. If a part is worn, we walk you through exactly what we found before any work begins and we explain whether one side needs attention or both, since that changes the cost. You can learn more about our shop or reach out to our team if your ride feels bouncier or looser than it should.
FAQs
Are shocks and struts the same?
No. People use the words interchangeably as they are not the same. A strut supports the car’s weight and includes a spring whereas a shock only helps control movement.
Do I need to replace both at once?
Not always. They are usually replaced in pairs on the same side of the car. If one is worn out then the other may be close behind.
How do I know which one my car has?
It depends on the car and model. Many front wheel drive cars have struts in front and shocks in the back but not all.
If I can only replace one now which should go first?
Replace the one that shows more wear like leaking and uneven tire wear or the car dipping when braking.
How long do they last?
Usually between 80,000 and 160,000 km depending on road conditions and driving habits.