BMW 3 Series Boot Strut Replacement Guide

Byrealshark64

Applicable Vehicles and Replacement Timing

This guide applies to various BMW 3 Series models. Boot struts typically need replacement every 5-7 years, or sooner if showing signs of failure. Replacing them promptly ensures safety and convenience.

How do I know my BMW 3 Series boot strut needs replacing?

Failing boot struts exhibit several symptoms. The boot may not stay open on its own, or it might slam shut unexpectedly. You may notice a leaking fluid on the strut or hear squeaking noises during operation. Increased effort to lift or lower the boot is also a sign the struts require replacement.

What size strut does a BMW 3 Series need?

The correct strut size depends on the specific 3 Series model and year. Refer to the table below for common specifications, but always verify by measuring your existing strut from eye-to-eye when fully extended and compressed, or consult your vehicle’s manual.

Model Year Extended Length (mm) Compressed Length (mm) Force (N)
E90 (Saloon) 2005-2012 520 320 450
F30 (Saloon) 2012-2019 530 330 480
G20 (Saloon) 2019-Present 540 340 500
F31 (Touring) 2012-2019 550 350 520

Note: These are typical values. Always confirm the exact specifications for your vehicle before ordering replacement struts. You can use our Gas Spring Force Calculator to estimate the required force.

How to Replace Gas Struts on a BMW 3 Series Boot (Step-by-Step Guide)

Replacing boot struts on a BMW 3 Series is a straightforward process that can be completed with basic tools. Follow these steps for a successful replacement. If the boot is heavy, ensure you have a prop to hold it open safely while you work.

Step 1: Gather Your Tools and Materials

You’ll need the following:

  • New gas struts (pair or single, depending on recommendation)
  • Flathead screwdriver or trim removal tool
  • Gloves
  • Safety glasses
  • A prop to hold the boot open

Step 2: Prepare the Vehicle

Open the boot and use the prop to hold it securely in the open position. This is crucial for safety.

Step 3: Locate the Existing Struts

The boot struts are located on either side of the boot opening, connecting the boot lid to the body of the car.

Step 4: Detach the Old Struts

Using a flathead screwdriver or trim removal tool, carefully detach the retaining clips that secure the strut ends to the ball joints. Note the orientation of the clip for easier reinstallation.

  • Insert the screwdriver under the clip and gently pry it away from the ball joint.
  • Once the clip is loose, the strut end should detach with a gentle pull.
  • Repeat this process for both ends of the strut.

Important: Work on one strut at a time to prevent the boot from falling. If replacing both simultaneously, have a helper hold the boot, or use a sturdy prop.

Step 5: Install the New Struts

Align the new strut ends with the ball joints. Press firmly until the strut end snaps into place and the retaining clip engages fully. Ensure the clip is securely fastened.

Step 6: Test the Boot Operation

Remove the prop and carefully test the boot by opening and closing it a few times. The boot should stay open on its own and close smoothly without slamming. If it doesn’t, recheck the strut installation.

Step 7: Repeat for the Other Side (If Necessary)

If you’re replacing both struts, repeat steps 4-6 for the other side.

Car Boot Gas Strut Not Holding Up? Causes and Fixes

If your newly installed strut isn’t holding up, there could be a few reasons. You might have purchased the wrong force rating, or the ball joints could be worn. Extremely cold weather can also temporarily reduce strut performance. Double-check the strut specifications and ball joint condition. For a deeper dive, read our guide on Gas Strut Too Weak.

OEM vs Aftermarket Gas Struts: Worth Paying More for OEM?

OEM (Original Equipment Manufacturer) struts are made by the same manufacturer that supplied the parts to BMW. Aftermarket struts are made by third-party companies. OEM struts are generally more expensive but often offer better quality and longevity. Aftermarket struts can be a cost-effective alternative, but quality can vary. Consider brands like Stabilus for a reliable aftermarket option. More information can be found in our Gas Strut Brands Compared article.

Where can I buy a BMW 3 Series boot strut?

You can buy replacement boot struts from various sources:

  • Online Retailers: Amazon, eBay, etc. (Use the make/model fitment checker if available)
  • Auto Parts Stores: Euro Car Parts, Halfords (UK)
  • BMW Dealerships: For OEM parts

Looking for Stabilus gas struts for your vehicle? Check availability and fitment on Amazon

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