🔧 Corolla - Strut Replacement

You’ll be removing the old strut assemblies and installing new ones so the suspension can control bumps properly again, reduce noise, and restore ride height. This involves safely lifting the car, disconnecting suspension links, and unbolting the struts from the steering knuckle and body.

Difficulty Level: Intermediate | Estimated Time: 3-5 hours for both fronts (add 2-3 hours if doing rears too)

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Quick question before we start: Are you planning to replace the front struts only, the rear shocks/struts only, or all four corners on your Corolla?

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⚠️ Safety & Precautions

• ⚠️ Always support the car with jack stands; never rely only on a floor jack.
• ⚠️ A spring compressor is required if your new struts do not come as complete “quick struts”; the spring is under high tension and can be dangerous.
• ⚠️ Wear safety glasses and mechanic gloves to protect your eyes and hands.
• ⚠️ Work on a flat, solid surface so the car cannot roll or sink.
• ⚠️ After this repair, a wheel alignment is strongly recommended to avoid uneven tire wear and pulling.
• ⚠️ Do not loosen the large center nut on the strut top until the spring is safely compressed or you are using a complete assembly.

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🔧 Required Tools

You'll need the following tools for this repair:

• 🛠️ Floor jack (rated 3-ton minimum)
• 🛠️ Jack stands (rated 3-ton minimum, Qty: 2-4)
• 🛠️ Wheel chocks
• 🛠️ Lug wrench or 21mm socket
• 🛠️ Socket set (10mm–21mm)
• 🛠️ 17mm socket
• 🛠️ 19mm socket
• 🛠️ 21mm socket
• 🛠️ 10mm socket
• 🛠️ 14mm socket
• 🛠️ Ratchet (3/8" and 1/2")
• 🛠️ Breaker bar 1/2"
• 🛠️ Torque wrench 3/8" (up to 80 ft-lbs)
• 🛠️ Torque wrench 1/2" (up to 150 ft-lbs)
• 🛠️ Open/box end wrench set (10mm–21mm)
• 🛠️ Spring compressor (external, screw-type) (specialty)
• 🛠️ Pry bar (medium)
• 🛠️ Flathead screwdriver (medium)
• 🛠️ Needle nose pliers
• 🛠️ Hammer (small or rubber mallet)
• 🛠️ Penetrating oil spray
• 🛠️ Paint marker or white correction pen
• 🛠️ Safety glasses
• 🛠️ Mechanic gloves
• 🛠️ Shop rags
• 🛠️ Measuring tape

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• 🔩 Front complete strut assemblies (loaded struts) - Qty: 2 (recommended, includes spring and mount)
• 🔩 Rear shocks or rear strut assemblies - Qty: 2 (if doing rears)
• 🔩 New front strut upper mounting nuts - Qty: 6
• 🔩 New front strut-to-steering-knuckle bolts and nuts - Qty: 4
• 🔩 New stabilizer (sway bar) link nuts - Qty: 2
• 🔩 Anti-seize compound - Qty: 1 small tube
• 🔩 Penetrating oil - Qty: 1 can
• 🔩 Paint marker (for alignment marking) - Qty: 1

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📋 Before You Begin

• Park the Corolla on a level surface, set the parking brake, and place wheel chocks behind the rear wheels.
• Loosen (do not remove) the front wheel lug nuts with a 21mm socket while the car is still on the ground.
• Decide if you are using complete strut assemblies or reusing springs. Complete assemblies are much safer and easier for a beginner.
• If you must reuse springs, carefully read all instructions for the spring compressor; this tool squeezes the coil spring so you can safely remove the top mount.
• Gather all tools and parts so you are not searching mid-job. Lay tools out in order of use.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Lift and Support the Front of the Car

• Use the floor jack under the front center jacking point (just behind the front bumper on the subframe) to raise the front of the Corolla.
• Place jack stands under the left and right front pinch welds or frame points, then slowly lower the car onto the stands using the floor jack.
• Remove the front wheels using a 21mm socket and ratchet or lug wrench.
• Keep the wheels under the car near the jack stands as a backup safety measure. Extra safety never hurts.

Step 2: Locate and Prepare the Front Strut Area

• Turn the steering wheel to the left to access the right strut, and to the right to access the left strut. This gives more room around the back of the strut.
• Spray penetrating oil on the two large strut-to-steering-knuckle bolts and the sway bar link nut where it attaches to the strut.
• Let the oil soak while you move to the top of the strut under the hood.

Step 3: Loosen (But Do Not Remove) the Strut Top Nuts

• Open the hood and locate the three small nuts at the top of each strut tower.
• Use a 14mm socket and ratchet to slightly loosen all three nuts on the side you are working on, but do not remove them yet. Leave several full threads engaged.
• Do not remove or loosen the large center nut at this time.

Step 4: Disconnect the Brake Hose Bracket and ABS Wire from the Strut

• On the strut body you will see brackets holding the brake hose and ABS sensor wire.
• Use a 12mm or 10mm socket (usually 12mm) to remove the small bolt holding the brake hose bracket to the strut.
• Use needle nose pliers or a flathead screwdriver to gently release the ABS wire from any plastic clips on the strut.
• Move the hose and wire out of the way. Do not let them hang under strain.

Step 5: Disconnect the Sway Bar Link from the Strut

• The sway bar (stabilizer) link connects to a tab on the strut with a nut.
• Use a 17mm socket and ratchet or wrench to remove the sway bar link nut from the strut tab.
• If the stud spins, insert an Allen key (if provision exists) or use a 17mm wrench on the nut and locking pliers on the back of the stud (on the flat spots if present). Do not grab the smooth shaft directly.
• Push the link out of the strut tab and move it aside.

Step 6: Mark the Strut-to-Knuckle Position

• Use a paint marker to draw alignment marks where the strut meets the steering knuckle on both bolts.
• This helps keep alignment closer to original, but you will still need an alignment later.

Step 7: Remove the Strut-to-Steering-Knuckle Bolts

• Support the steering knuckle/hub from below using the floor jack (a little pressure only) so it does not drop suddenly.
• Use a 19mm or 21mm socket on the bolt head and a 19mm or 21mm wrench on the nut to loosen the two large bolts connecting the strut to the steering knuckle.
• A breaker bar will help crack them loose if they are tight.
• Remove the nuts and tap the bolts out with a hammer gently if needed. Do not damage the threads.
• Once free, carefully lower the jack under the knuckle slightly to give the strut room to come out.

Step 8: Remove the Old Strut Assembly

• Back under the hood, use a 14mm socket to remove the three top mounting nuts you left partially threaded.
• Support the strut from below with your other hand as you remove the last nut so it does not fall.
• Carefully guide the strut out of the wheel well. You may need to angle it around the fender liner. Take your time and don’t force it.

Step 9A: If Using Complete Strut Assemblies (Recommended)

• Compare the new strut assembly to the old one: check overall length, spring orientation, and top mount position.
• Make sure the spring ends sit in the same clock position as the old unit.
• Move to Step 10 to install the new strut.

Step 9B: If Reusing Springs (Spring Compressor Required)

• Attach the spring compressor to opposite sides of the coil spring according to the tool’s instructions.
• Use a ratchet or wrench to slowly and evenly tighten both sides until the spring is clearly loose from the top and bottom seats.
• Once compressed, use a socket and ratchet (often 17mm–19mm) with the correct method to hold the strut shaft (Allen key or wrench on flats) to remove the center top nut.
• Carefully remove the top mount and upper spring seat, then lift the spring off and transfer it to the new strut.
• Make sure the bottom of the spring end sits correctly in the lower spring seat notch on the new strut.
• Reinstall the upper spring seat and top mount, then install the center nut finger-tight.
• Slowly and evenly release the spring compressor until the spring is fully seated.
• Torque the center nut with a torque wrench to the replacement strut manufacturer’s spec (varies by brand, usually around 50–70 Nm (37–52 ft-lbs)—check the instructions).

Step 10: Install the New Strut Assembly

• Guide the new strut into the wheel well and up through the hole in the strut tower.
• Thread on the three top nuts by hand from under the hood using a 14mm socket or fingers. Do not fully tighten yet.
• Line up the lower strut bracket with the steering knuckle.
• Insert the two new strut-to-knuckle bolts by hand and install the nuts.

Step 11: Torque the Strut-to-Knuckle Bolts

• Use a 19mm or 21mm socket and 19mm or 21mm wrench to snug both bolts and nuts.
• Align the paint marks you made earlier as closely as possible.
• Torque each bolt with a 1/2" torque wrench to 177 Nm (131 ft-lbs).

Step 12: Reattach the Sway Bar Link

• Insert the sway bar link stud back into the strut tab.
• Install a new nut and tighten with a 17mm socket and ratchet.
• Torque to 55 Nm (41 ft-lbs).

Step 13: Reattach Brake Hose Bracket and ABS Wire

• Position the brake hose bracket back against the strut and install the small bolt using a 10mm or 12mm socket.
• Torque to about 25 Nm (18 ft-lbs) (snug, not crazy tight).
• Clip the ABS wire back into all its holders on the strut using your hands or needle nose pliers.

Step 14: Torque the Strut Top Nuts

• Under the hood, use a 14mm socket and 3/8" torque wrench to tighten the three top strut nuts.
• Torque each nut to 39 Nm (29 ft-lbs).
• If the stud slightly turns, hold it gently with the correct tool (Allen or thin wrench) while tightening the nut.

Step 15: Repeat on the Other Side

• Repeat Steps 2–14 on the other front strut.
• Do one side at a time so you can compare.

Step 16: Reinstall Wheels and Lower the Car

• Reinstall the front wheels using a 21mm socket and snug the lug nuts by hand in a star pattern.
• Raise the car slightly with the floor jack, remove the jack stands, then carefully lower the car to the ground.
• With the car on the ground, torque the wheel lug nuts in a star pattern to 103 Nm (76 ft-lbs) using a 1/2" torque wrench.

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✅ After Repair

• Start the engine and carefully turn the steering wheel lock-to-lock to ensure nothing is rubbing or binding.
• Take a short, slow test drive over a smooth road, listening for clunks, pops, or rubbing. No hard braking or sharp turns yet.
• Recheck all visible nuts and bolts for tightness after the test drive, especially the strut-to-knuckle bolts and top mount nuts.
• Schedule a professional wheel alignment as soon as possible to protect your tires and steering feel.
• Over the next few days, listen for new noises and visually inspect for any loose brackets or leaks.

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💰 DIY vs Shop Cost

Shop Cost: $600-$950 (parts + labor) for both front struts

DIY Cost: $220-$450 (parts only, using complete assemblies)

You Save: $380-$500 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 2-3 hours.

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🎯 Ready to get started?

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