Subaru Outback Suspension Strut Bellows and Dust Boot Guide (2008-2020)
Protect your Outback's struts from expensive damage by understanding this critical, often-overlooked part.
- A torn strut bellow is a guaranteed future failure for the more expensive strut; inspect them regularly.
- Replacing only the bellow requires strut disassembly with a spring compressor, a difficult and potentially dangerous job.
- KYB is the OEM supplier for Subaru, making their aftermarket bellows and struts a high-quality choice for restoring original performance.
- A four-wheel alignment is mandatory immediately after replacing struts or bellows to prevent unsafe handling and tire damage.
Is Your Outback's Ride Getting Worse? Check the Boots.
A torn strut bellow is a small problem that quickly leads to a big one. On its own, a ripped boot doesn't change how your Outback drives. But it's a warning sign. Once it's torn, it's only a matter of time before the expensive strut it's supposed to protect fails. The strut is filled with oil to control your car's bouncing. The bellow keeps dirt away from the seal that holds the oil in. When the bellow rips, dirt acts like sandpaper on the seal, causing a leak and ruining the strut.
Symptoms of a Bad Strut Bellow
The most obvious sign is a visual one: look in your wheel well and see if the rubber boot covering the shiny metal rod of the strut is cracked, ripped, or missing. If the boot has been torn for a while, you'll start to notice the symptoms of the strut itself failing:
- Bouncy or Unstable Ride: The car feels floaty and continues to bounce after hitting bumps.
- Clunking Noises: You may hear a knocking or clunking sound when driving over bumps, which is the sound of the suspension bottoming out.
- Nose-Diving: The front of your Outback dips down hard when you brake.
- Uneven Tire Wear: A bad strut can cause tires to develop scalloped or "cupped" wear patterns as the wheel bounces down the road.
- Visible Oil Leaks: Look for oily, wet fluid on the body of the strut itself. This is a sure sign the strut seal has failed.
Don't Ignore a Torn Bellow
Driving with a torn bellow will cause the strut to fail. Replacing a bellow is much cheaper than replacing a strut that has been damaged by dirt and water intrusion.
Choosing the Right Aftermarket Bellows
When replacing strut bellows, you have a few options. Since the labor to replace just the bellow is the same as replacing the entire strut cartridge, it's critical to use a quality part. For the 2008-2020 Subaru Outback, two common brand tiers are available.
Premium Aftermarket (OEM Quality)
KYB is widely known to be the original equipment manufacturer (OEM) for Subaru's suspension components. Choosing a KYB strut bellow kit means you are getting a part that is equivalent in quality and fit to the original part that came on your car. They are the preferred choice of many Subaru specialists and owners for restoring the original ride and ensuring long-term protection for the strut.
Standard Aftermarket
Brands like Skyward offer a more budget-friendly option. These parts are designed to meet the basic fit and function requirements for your Outback. While they provide a cost-effective solution, they may not use the same materials or have the same rigorous testing as an OEM-supplier brand like KYB. They are a viable choice for drivers looking for an immediate, low-cost repair.
Pro Tip: Replace in Pairs
Suspension components should always be replaced in pairs (both front struts or both rear struts) to ensure even handling and performance. If you are disassembling the strut to replace the bellow, it is also the perfect time to replace the strut mount and the strut itself if it has high mileage.
Cost of Replacing Suspension Strut Bellows on a Subaru Outback (2008-2020)
| Part/Service | Estimated Cost |
|---|---|
| Aftermarket Strut Bellow Kit (KYB, Skyward) | $20 - $45 per kit |
| Shop Labor (Bellows Only) | $250 - $500 |
| Complete Strut Assembly (Aftermarket) | $120 - $250 per side |
| Shop Labor (Complete Strut Assembly) | $200 - $400 |
| Wheel Alignment (Required) | $100 - $200 |
Frequently Asked Questions
Can I replace just the strut bellow?
Yes, but it is an advanced job. You must remove the entire strut assembly from the car and then use a special tool called a spring compressor to safely remove the coil spring. This tool can be dangerous if used incorrectly. Because of the labor involved, many people choose to replace the entire pre-assembled "quick-strut" which includes a new strut, spring, mount, and bellow.
Do I need a wheel alignment after replacing strut bellows?
Yes, absolutely. Any time the strut is unbolted from the steering knuckle, the alignment angles are changed. You must get a four-wheel alignment immediately after the repair to ensure your Outback drives safely and to prevent rapid tire wear.
What is included in a strut bellow kit?
A typical kit includes the flexible dust boot (the bellow) and a new foam bump stop. The bump stop is a crucial part that prevents the strut from bottoming out on harsh bumps.
Is KYB the same as the original Subaru part?
KYB is the original equipment manufacturer for many Subaru suspension parts. This means the KYB aftermarket part is made to the same standards and specifications as the part you would get from a Subaru dealer, often at a lower price.
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Technical Specifications
The strut bellow is a flexible, protective dust cover, typically made of rubber or thermoplastic, designed to fit over the strut piston rod. It includes an internal jounce bumper (bump stop) made of polyurethane foam.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Subaru Outback:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Outback's Ride Getting Worse? Check the Boots.
- Symptoms of a Bad Strut Bellow
- Don't Ignore a Torn Bellow
- Choosing the Right Aftermarket Bellows
- Premium Aftermarket (OEM Quality)
- Standard Aftermarket
- Pro Tip: Replace in Pairs
- Cost of Replacing Suspension Strut Bellows on a Subaru Outback (2008-2020)
- Frequently Asked Questions
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