Complete Boot Lid Strut Replacement Guide
Why Replace Your Boot Lid Struts?
Boot lid struts, also known as gas springs or gas struts, are essential for the smooth and safe operation of your car’s boot. Over time, these struts can wear out, leading to a boot lid that either slams shut or doesn’t stay open. Replacing them ensures your boot operates safely and conveniently.
This guide provides a comprehensive overview of how to replace boot lid struts, covering everything from identifying when replacement is needed to a step-by-step replacement process.
How do I know my car strut needs replacing?
If your car’s boot lid struggles to stay open, slams shut unexpectedly, or requires excessive force to close, it’s likely that the gas struts need replacing. Other symptoms include visible leaks, rust, or physical damage to the struts.
- Boot lid doesn’t stay open on its own.
- Boot lid slams shut unexpectedly.
- Visible signs of wear, such as leaks or rust.
- Excessive effort required to close the boot.
These issues not only cause inconvenience but can also pose safety risks. Addressing them promptly is crucial for maintaining your vehicle’s functionality and safety. Refer to our Gas Spring Force Calculator to help determine the correct replacement force.
What size strut does a car need?
The size and force rating of boot lid struts vary depending on the vehicle make and model. Accurate measurements are crucial for selecting the correct replacement. Below is a general guide on how to determine the appropriate size, but always verifying against manufacturer specifications is important.
| Measurement | Description | How to Measure |
|---|---|---|
| Extended Length | The total length of the strut when fully extended. | Measure from the centre of one end fitting to the centre of the other when the strut is fully extended. |
| Compressed Length | The total length of the strut when fully compressed. | Measure from the centre of one end fitting to the centre of the other when the strut is fully compressed. |
| Stroke Length | The difference between the extended and compressed lengths. | Subtract the compressed length from the extended length. |
| Force Rating (N) | The amount of force the strut exerts, measured in Newtons. | This is usually printed on the strut itself. If not, contact a supplier with your vehicle details. |
For instance, a Ford Focus might require a different strut size compared to a VW Golf. Always double-check the manufacturer’s specifications for your specific vehicle model. You can also refer to existing guides such as How to Measure Gas Struts for Car Boot Replacement.
How to Replace Boot Lid Struts: Step-by-Step Guide
Replacing boot lid struts is a straightforward task that most car owners can accomplish with basic tools and a bit of patience. Follow these steps to ensure a successful replacement.
Tools and Materials Needed
- New boot lid struts
- Flathead screwdriver or trim removal tool
- Safety glasses
- Gloves
- Assistant (optional, but recommended)
Step-by-Step Instructions
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Prepare the Vehicle
Park your car on a level surface and ensure the boot area is clear. Gather your tools and new struts. Having an assistant can make the job easier, especially when supporting the boot lid.
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Support the Boot Lid
Before removing the old struts, secure the boot lid to prevent it from falling. Use a prop rod or ask your assistant to hold the lid open. Safety is paramount here, as a sudden drop can cause injury or damage. You can often use a length of wood or even a sturdy broom handle as a temporary support.
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Remove the Old Struts
Locate the gas struts on either side of the boot. They are typically attached to the boot lid and the car body via ball-and-socket joints or similar connectors. Use a flathead screwdriver or a trim removal tool to gently pry off the retaining clips or springs that hold the strut in place.
Start by detaching one end of the strut. Be careful, as the strut may still have some force. Once one end is detached, carefully detach the other end. Repeat the process for the second strut.
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Install the New Struts
Take your new boot lid struts and align the end fittings with the mounting points. Attach one end of the strut first, ensuring it clicks or snaps securely into place. Then, attach the other end. You might need to slightly compress or extend the strut to align the fittings properly. Ensure the retaining clips or springs are correctly in place to secure the strut.
Repeat the process for the second strut on the other side of the boot.
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Test the Boot Lid
Remove the prop rod or have your assistant release the boot lid. Slowly lower the boot lid to test the new struts. The boot should stay open on its own and close smoothly without slamming. If the boot lid operates as expected, the replacement is successful.
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Check for Proper Operation
Open and close the boot lid several times to ensure the struts are functioning correctly. Check for any unusual noises or movements. If you notice any issues, double-check the strut attachments and ensure they are secure.
Troubleshooting Common Issues
Even with careful installation, some issues may arise. Here are a few common problems and how to address them.
Boot Lid Doesn’t Stay Open
If the boot lid still doesn’t stay open after replacing the struts, the new struts might be faulty or have an insufficient force rating. Double-check the specifications of the struts. If the force rating is correct, contact the supplier for a replacement set.
Boot Lid Closes Too Quickly
If the boot lid closes too quickly, the struts may have an excessive force rating. This can be dangerous, as it can cause the lid to slam shut unexpectedly. Replace the struts with ones that have a lower force rating.
Struts are Difficult to Compress
If the struts are difficult to compress during installation, ensure they are the correct size for your vehicle. If they are, apply firm, even pressure to compress them.
Safety Tips
- Always wear safety glasses to protect your eyes from debris or accidental spring releases.
- Use gloves to protect your hands.
- Ensure the boot lid is properly supported before removing the old struts.
- If you’re unsure about any step, seek assistance from a qualified mechanic.
When to replace your struts
While this guide provides general steps, specific vehicles might have unique requirements. Always consult your vehicle’s service manual for detailed instructions and torque specifications. For example, bonnet struts often have different installation considerations compared to boot struts.
Where to Buy Replacement Boot Lid Struts
Replacement boot lid struts can be purchased from various sources, including:
- Auto Parts Stores: Local auto parts stores like AutoZone, Halfords, and Euro Car Parts.
- Online Retailers: Online retailers like Amazon offer a wide selection of boot lid struts.
- Dealerships: Your car’s dealership can provide OEM replacement parts.
When purchasing, ensure the struts match your vehicle’s make, model, and year and check fitment guides. Always prioritise reputable brands such as Stabilus, Sachs, Monroe and Meyle. A good option is the car boot struts available on Amazon.
You should also check out our guide to OEM vs Aftermarket Gas Struts.
Conclusion
Replacing boot lid struts is a manageable task that enhances your vehicle’s safety and convenience. By following this comprehensive guide, you can confidently replace your old struts and ensure your boot lid operates smoothly. If you have any issues, consult a professional mechanic.
For bespoke or bulk orders, contact our industrial team.