What a strut does and when it needs replacing

A strut is a shock absorber combined with a spring that holds up the front or rear of your vehicle and keeps the wheels on the road when you turn or hit a bump. Over time — usually between 50,000 and 100,000 miles, depending on your driving and road conditions — the internal fluid leaks out or the spring weakens, and the strut stops working. When that happens, your car bounces after bumps, pulls to one side, or makes clunking noises over potholes.

Replacing a strut is a job you can do yourself if you have basic mechanical skills and the right tools, or you can take it to a shop and pay a technician to do it. The process is the same either way: remove the wheel, disconnect the old strut from the steering knuckle and the frame, install the new one, and reconnect everything. Most vehicles need the front struts replaced more often than the rear ones.

Key Takeaways

  • A worn strut causes bouncing after bumps, uneven tire wear, and pulling to one side — signs that replacement is overdue.
  • You will need a jack, jack stands, a wrench set, a spring compressor (if doing it yourself), and the correct replacement strut for your vehicle's year, make, and model.
  • The job involves removing the wheel, unbolting the strut from the steering knuckle and frame, and installing the new strut in reverse order.
  • If you are not comfortable working under a raised vehicle or do not have the tools, a shop can complete the job in one to two hours per strut.

Gather the right tools and parts before you start

Before you touch anything, buy the correct replacement strut. Go to an auto parts store or online retailer with your vehicle's year, make, model, and engine size, and order the strut for the side you are replacing (driver's side or passenger's side, front or rear). Some struts come as a complete assembly; others come as separate spring and shock components. Check your vehicle's manual or the parts listing to see which type yours uses.

You will also need a floor jack, jack stands, a socket set with wrenches, a spring compressor (if your strut has a separate spring), an adjustable wrench, and a torque wrench to tighten bolts to the manufacturer's specification. If you do not own these tools, renting them from an auto parts store is cheaper than buying them outright. Wear safety glasses and work gloves throughout the job.

Remove the wheel and disconnect the strut from the steering knuckle

Raise the vehicle on a level surface using the floor jack, then find it with jack stands under the frame — never work under a car supported only by a jack. Remove the wheel by unbolting the lug nuts and setting them aside in a safe place.

Locate the bolts that connect the strut to the steering knuckle (the part that holds the wheel hub). These are usually two or three bolts on the inside of the wheel well. Use the correct socket to unbolt them, then carefully pull the steering knuckle away from the strut. You may need to tap it gently with a rubber mallet to separate them. Do not let the steering knuckle hang by the brake line — support it with a wire or jack to prevent damage.

Disconnect the strut from the frame and remove the spring if needed

Inside the engine bay, locate the bolts or nuts that connect the top of the strut to the vehicle's frame. These are usually three bolts arranged in a triangle. Unbolt them and remove the strut from the vehicle. If your strut has a separate spring, you will need to compress the spring using a spring compressor before you can remove it from the old strut. Follow the compressor's instructions carefully — a compressed spring can cause injury if it is released suddenly.

If the strut comes as a complete assembly (spring and shock together), you can skip the spring compressor step and move straight to installation. Transfer any brackets or hardware from the old strut to the new one if they are not already attached.

Install the new strut and reconnect everything

Slide the new strut up through the wheel well and align the top bolts with the holes in the frame. Insert and hand-tighten the three top bolts first, then use a torque wrench to tighten them to the torque specification listed in your vehicle's manual (usually between 15 and 30 foot-pounds, depending on the vehicle). Do not over-tighten, as this can strip the threads.

Next, guide the bottom of the strut toward the steering knuckle and align the bolt holes. Insert the bolts and hand-tighten them, then use the torque wrench to tighten them to specification. Reinstall the wheel, lower the vehicle, and tighten the lug nuts in a star pattern (alternating across the wheel) to may support even pressure.

Test the vehicle and check your work

Before driving on the road, start the engine and turn the steering wheel fully left and right to make sure nothing is binding. Drive slowly in a parking lot or quiet street and listen for any clunking or squeaking noises. If everything sounds normal, drive at normal speeds and pay attention to how the vehicle handles bumps — it should feel firmer and less bouncy than before.

If you hear noise or the vehicle still bounces excessively, stop and check that all bolts are tight and that the strut is seated correctly. If the problem persists, the new strut may be defective, or there may be another suspension component that also needs replacement. Many shops will inspect the rest of your suspension for free if you ask.

When to take it to a shop instead

If you do not have a jack, jack stands, or a spring compressor, or if you are not comfortable working under a raised vehicle, a repair shop can do this job in one to two hours per strut. The cost varies widely by vehicle and location — a straightforward strut replacement at an independent shop might run $300 to $600 per strut, while a dealership may charge $500 to $1,000 or more. Some shops offer a warranty on the parts and labor, which can be worth the extra cost if something goes wrong.

Shops also have alignment equipment, so they can check and adjust your wheel alignment after the replacement if needed. Worn struts often cause uneven tire wear, and alignment issues can make new tires wear out quickly, so this step is worth the investment.

Frequently Asked Questions

Do I have to replace both struts at the same time?

No, but many technicians recommend it. If one strut is worn, the other is usually close behind, and replacing both ensures even handling and prevents the vehicle from pulling to one side. If you replace only one, the other will wear faster to match it.

What happens if I drive on a bad strut?

A worn strut reduces your control over the vehicle, especially during braking and turning. It also causes uneven tire wear, which shortens tire life and increases your fuel costs. Continuing to drive on a very worn strut can eventually damage the steering knuckle or other suspension parts, leading to a more expensive repair.

Can I replace a strut without a spring compressor?

Only if your strut comes as a complete assembly with the spring already attached. If the spring and shock are separate, you must use a spring compressor to safely remove and install the spring. Attempting to do this without a compressor risks serious injury.

How do I know which strut to buy?

Bring your vehicle's year, make, model, and engine size to an auto parts store, or enter that information on an online retailer's website. The system will show you the correct strut for each position (front driver's side, front passenger's side, rear driver's side, rear passenger's side). Some vehicles use different struts on different sides, so make sure you order the right one for the position you are replacing.

Will replacing the strut affect my wheel alignment?

Possibly. Removing and reinstalling the steering knuckle can shift the alignment slightly. If you notice the vehicle pulling to one side after the replacement, or if your tires start wearing unevenly, have the alignment checked. Many shops include an alignment check for free after a strut replacement.