The suspension system in your vehicle plays a critical role in ensuring a smooth and controlled ride. One of its key components is the strut mount, which connects the strut assembly to the vehicle’s chassis. Over time, strut mounts wear out, leading to noise, poor handling, and potential safety risks.

This 2,800-word guide covers everything you need to know about strut mount replacement service, including:

• What strut mounts are and their function

• Symptoms of a failing strut mount

• Causes of strut mount failure

• Diagnosis and inspection

• Strut mount replacement process

• Cost of replacement

• DIY vs. professional service

• Preventive maintenance tips

By the end of this article, you’ll have a thorough understanding of why strut mounts are essential, when to replace them, and how the replacement process works.

1. What Are Strut Mounts and What Do They Do?

Definition and Function

Strut mounts, also called strut bearings or strut top mounts, are critical components of a vehicle’s MacPherson strut suspension system. They serve two main purposes:

1. Provide a Pivot Point for Steering

   • The strut mount allows the strut assembly to rotate smoothly when turning the steering wheel.

   • This ensures responsive handling and smooth steering input.

2. Absorb Road Vibrations and Impacts

   • The mount contains rubber or polyurethane bushings that dampen vibrations from rough roads.

   • It prevents excessive noise and harshness from transferring into the cabin.

Components of a Strut Mount

A typical strut mount consists of:

• Upper Bearing Plate – Allows rotational movement for steering.

• Rubber Isolator – Absorbs shocks and vibrations.

• Metal Housing – Provides structural support.

Since strut mounts endure constant stress, they eventually wear out and require replacement.

2. Symptoms of a Failing Strut Mount

Recognizing the signs of a bad strut mount early can prevent further suspension damage. Here are the most common symptoms:

1. Knocking or Clunking Noises

• A worn strut mount often produces a loud clunking or knocking sound when driving over bumps or uneven roads.

• The noise comes from excessive play in the mount’s bearing or deteriorated rubber.

2. Poor Steering Response

• If the strut mount’s bearing seizes or wears out, steering may feel stiff or unresponsive.

• You might notice excessive play in the steering wheel or a loose handling feel.

3. Uneven Tire Wear

• A failing strut mount can cause misalignment, leading to uneven tire wear (especially on the inner or outer edges).

4. Excessive Vibration in the Cabin

• Worn-out rubber bushings lose their ability to absorb shocks, resulting in more road noise and vibrations inside the car.

5. Visible Damage or Sagging

• In severe cases, you may see cracks in the rubber isolator or metal corrosion on the mount.

• A collapsed mount can cause the vehicle to sit lower on one side.

If you experience any of these issues, a strut mount inspection is necessary.

3. Causes of Strut Mount Failure

Several factors contribute to strut mount wear and tear:

1. Normal Wear and Tear

• Over time, the rubber bushings dry out and crack, while the bearing loses lubrication.

• Most strut mounts last 50,000 to 100,000 miles, depending on driving conditions.

2. Rough Road Conditions

• Frequent driving on potholes, speed bumps, or rough terrain accelerates wear.

3. Corrosion (Rust)

• In areas with road salt or high humidity, the metal components can rust, weakening the mount.

4. Improper Installation

• If a strut mount is not torqued correctly during replacement, it can fail prematurely.

5. Overloading the Vehicle

• Carrying excessive weight puts extra strain on the suspension, leading to faster wear.

4. Diagnosing a Bad Strut Mount

Before replacing a strut mount, proper diagnosis is essential. Here’s how mechanics check for issues:

1. Visual Inspection

• Look for cracked rubber, rust, or separation in the mount.

• Check if the strut is misaligned or tilting abnormally.

2. Noise Test

• Have an assistant turn the steering wheel while you listen for grinding or clicking noises near the strut tower.

3. Bounce Test

• Push down on each corner of the vehicle. If it bounces excessively, the strut or mount may be worn.

4. Road Test

• Drive over bumps and listen for knocking sounds or feel for steering looseness.

If the strut mount is confirmed faulty, replacement is the next step.

5. Strut Mount Replacement Process

Replacing a strut mount involves disassembling the strut assembly. Here’s a step-by-step breakdown:

Tools Needed

• Jack and jack stands

• Socket set and wrenches

• Spring compressor (for strut disassembly)

• Torque wrench

• Pry bar (for removing old mounts)

Step-by-Step Replacement

1. Lift and Secure the Vehicle

• Use a jack to lift the car and place it on jack stands for safety.

• Remove the wheel to access the strut assembly.

2. Disconnect the Strut Assembly

• Unbolt the strut from the steering knuckle (lower connection).

• Remove the strut tower bolts (inside the engine bay or wheel well).

3. Compress the Strut Spring

• Using a spring compressor, compress the coil spring to release tension.

• Warning: Never remove the center nut without compressing the spring—it can explode dangerously.

4. Remove the Old Strut Mount

• Once the spring is compressed, remove the strut shaft nut and take off the old mount.

5. Install the New Strut Mount

• Place the new mount onto the strut shaft and reassemble the components in reverse order.

• Torque all bolts to the manufacturer’s specifications.

6. Reinstall the Strut Assembly

• Reattach the strut to the steering knuckle and strut tower.

• Reinstall the wheel and lower the vehicle.

7. Test Drive and Alignment Check

• After replacement, take the car for a test drive to ensure smooth operation.

• A wheel alignment is recommended to prevent uneven tire wear.

6. Cost of Strut Mount Replacement

The cost varies depending on vehicle make, model, and labor rates:

Parts Cost

• Strut Mount Only: $30 – $100 per side

• Complete Strut Assembly (with mount): $150 – $400 per side

Labor Cost

• Per Strut Mount: $100 – $300 (1-2 hours of labor)

• Per Complete Strut Assembly: $200 – $500 (2-3 hours)

Total Estimated Cost

• Per Side: $130 – $400

• Both Sides (Front or Rear): $260 – $800

Note: Some vehicles require replacing the entire strut assembly if the mount is not sold separately.

7. DIY vs. Professional Replacement

DIY Replacement (For Experienced Mechanics)

✅ Pros:

• Saves money on labor costs.

• Good learning experience for car enthusiasts.

❌ Cons:

• Requires specialized tools (spring compressor).

• High risk of injury if done incorrectly.

• May void warranty if improperly installed.

Professional Replacement (Recommended for Most Drivers)

✅ Pros:

• Ensures proper installation and torque specs.

• Comes with a warranty on parts and labor.

• Mechanics have the right tools and expertise.

❌ Cons:

• Higher cost due to labor charges.

Verdict: Unless you have advanced mechanical skills, professional replacement is safer and more reliable.

8. Preventive Maintenance Tips

To extend the life of your strut mounts:

✔ Avoid potholes and rough roads when possible.
✔ Check suspension components during routine maintenance.
✔ Listen for unusual noises and address them early.
✔ Replace struts in pairs to maintain balanced handling.

Conclusion

Strut mounts are a small but crucial part of your vehicle’s suspension system. When they fail, they cause noise, poor handling, and alignment issues. Recognizing the symptoms early and replacing worn mounts can improve ride comfort, safety, and tire longevity.

While DIY replacement is possible, professional service ensures proper installation and avoids risks. If you notice any signs of strut mount failure, consult a mechanic for an inspection and timely replacement.

By staying proactive, you can keep your suspension system in top shape and enjoy a smoother, safer driving experience.

FAQs About Strut Mount Replacement

Q: How long do strut mounts last?
A: Typically 50,000 to 100,000 miles, but harsh driving conditions can shorten their lifespan.

Q: Can I drive with a bad strut mount?
A: Not recommended—it can lead to steering problems, uneven tire wear, and further suspension damage.

Q: Should I replace both strut mounts at the same time?
A: Yes, replacing them in pairs ensures balanced suspension performance.

Q: Do I need an alignment after strut mount replacement?
A: Yes, because removing the strut can affect wheel alignment.

Q: Can bad strut mounts cause tire wear?
A: Yes, misalignment from a failing mount leads to uneven tire wear.

For any further questions, consult a trusted mechanic or suspension specialist.