What struts do and why you replace them
Struts are the shock absorbers and springs combined into one unit that sit at each wheel and control how your car bounces and handles turns. Over time — usually between 50,000 and 100,000 miles, though this varies by driving conditions and vehicle — the fluid inside wears out and the metal weakens. When that happens, your car bounces more after bumps, dips on one side when you turn, or feels unstable on the highway.
Replacing struts is one of the most common suspension repairs. You can do it yourself if you have basic mechanical skills, a safe workspace, and the right tools. If you are not confident working under a car or do not have the equipment, a shop will charge between $400 and $1,200 per axle depending on your vehicle and location.
Key Takeaways
- Struts typically last 50,000 to 100,000 miles and need replacement when your car bounces excessively, leans in turns, or feels unstable.
- You will need a jack, jack stands, a spring compressor, a strut socket, and new struts matched to your exact vehicle year, make, and model.
- The job involves removing the wheel, disconnecting the brake line and sway bar, unbolting the strut from the steering knuckle, and removing it from the top of the wheel well.
- Reassembly requires compressing the spring on the old strut, transferring it to the new one, and torquing all bolts to the manufacturer's specification.
- If you are uncomfortable with any step — especially spring compression or working under a raised vehicle — a shop is the safer choice.
Gather the right parts and tools before you start
Order struts that match your vehicle's year, make, model, and engine size. Do not guess. Go to a parts store with your vehicle identification number (VIN) — it is on your registration and on the driver's side dashboard — and they will pull the exact part. Struts come as a complete assembly or as separate springs and dampers; complete assemblies are easier for a first-timer.
You will also need: a floor jack rated for your vehicle's weight, two jack stands, a socket set with a strut socket (usually 18mm or 21mm, depending on your car), a spring compressor, a torque wrench, a breaker bar for stuck bolts, and new hardware if the old bolts are corroded. Rent the spring compressor from an auto parts store for $20 to $40 if you do not own one — it is essential and not optional.
Work in a level, well-lit space with room to move around. A driveway works if it is flat; a garage is better. Never work under a car supported only by a jack.
Remove the old strut from the wheel well
Loosen the lug nuts on the wheel while the car is still on the ground, then raise the vehicle with the floor jack and find it with jack stands under the frame. Remove the wheel completely. You will now see the strut assembly — a vertical shaft running from the top of the wheel well down to the steering knuckle at the wheel.
Disconnect the brake line bracket and the sway bar link from the strut. These are bolted on; unbolt them and move them aside. Do not disconnect the brake line itself — just the bracket that holds it to the strut.
At the top of the wheel well, inside the engine bay, you will see two or three bolts holding the strut to the car body. Unbolt these. At the bottom, the strut bolts to the steering knuckle; unbolt those as well. The strut will now come free. Slide it out and set it aside.
Transfer the spring and bearing to the new strut
The spring and bearing from your old strut can usually be reused on the new one. Set up the spring compressor on the old strut following the tool's instructions — it clamps around the spring and compresses it so you can remove the top nut safely. Compress the spring until there is no tension on the top nut, then unbolt the nut and remove the spring, bearing, and any rubber isolators.
Slide these parts onto the new strut in the same order they came off. Recompress the spring slightly to align the top nut hole, then thread the nut back on and torque it to the manufacturer's specification — usually 40 to 60 foot-pounds, but check your service manual. Slowly release the spring compressor.
If your new strut came as a complete assembly with spring already attached, skip this step entirely.
Install the new strut and reconnect everything
Slide the new strut into the wheel well and bolt it to the steering knuckle at the bottom first — this keeps it stable while you work. Use the torque wrench and tighten to spec, usually 70 to 100 foot-pounds depending on your vehicle. Then bolt the top of the strut to the car body and torque those bolts as well.
Reconnect the sway bar link and brake line bracket. Reinstall the wheel and tighten the lug nuts in a star pattern — this keeps the wheel centered. Lower the car to the ground, then torque the lug nuts again to final spec, usually 80 to 100 foot-pounds.
Repeat the entire process on the other side. Struts wear evenly, so if one is worn, the other is too.
Test the car and check your work
Before driving, bounce each corner of the car by hand — it should stop bouncing after one or two compressions. If it bounces multiple times, the strut may not be seated correctly. Take the car on a slow test drive on a quiet road and listen for clunking or squeaking. Check that the car does not lean excessively in turns and that the steering feels responsive.
After 100 miles, return to the shop or garage and retorque all the bolts you installed. Bolts can settle slightly after the first drive cycle.
When to call a shop instead
Spring compression is the most dangerous part of this job — a compressed spring can injure you if the compressor slips. If you do not have a compressor or are not confident using one, stop and take the car to a shop. The same applies if any bolt is seized or stripped, if you do not have a torque wrench, or if you are uncomfortable working under a raised vehicle. A shop has the equipment and insurance to handle these situations safely.
Shops also have alignment equipment. After strut replacement, your wheel alignment may shift slightly. Many shops include a four-wheel alignment in the strut job; if you do it yourself, budget $100 to $200 for an alignment check afterward.
Frequently Asked Questions
Can I replace just one strut?
Technically yes, but it is not recommended. Struts wear at the same rate on both sides of the axle. Replacing only one means the other will fail soon, and mismatched struts can cause uneven handling and accelerate tire wear. Replace them in pairs — both front or both rear at the same time.
What is the difference between struts and shocks?
Shocks are dampers only; they control bouncing but do not support the car's weight. Struts combine a damper and a spring into one unit and also support the weight. Most modern cars use struts on the front axle and shocks or struts on the rear. Your service manual will tell you which your car has.
How do I know if my struts are actually worn?
The car bounces noticeably after bumps, leans hard in turns, or dips on one side when you brake. You may also hear clunking from the wheel well or see oil leaking down the strut. A shop can inspect them visually and confirm wear, but these symptoms are usually reliable.
Do I need new bolts when I install new struts?
Not always, but if the old bolts are corroded, stripped, or difficult to remove, new ones are worth the $10 to $20. Use the same grade and size as the originals. Torque them to spec — under-torqued bolts can loosen, and over-torqued ones can strip.
How long does a strut replacement take?
For one strut, plan on two to four hours if you are experienced and have all the tools. For both front struts, four to six hours is realistic. A shop typically charges two to three hours of labor per axle, which is why the total bill runs $400 to $1,200 depending on the vehicle and location.