Subaru Forester Suspension Strut Bellows Guide (1998-2002)
Protect your Forester's struts from failure by understanding this small but critical part.
- A torn strut bellow will lead to the failure of the entire strut; it is not a cosmetic issue.
- KYB is an original equipment supplier for Subaru, making their aftermarket parts a highly reliable choice.
- Replacing only the bellow requires a spring compressor, a tool that can be dangerous. Replacing the full strut assembly is a safer DIY alternative.
- Always replace suspension components in pairs (both front or both rear) and get a wheel alignment afterward.
Symptoms of a Failing Strut Bellow
The most obvious sign of a problem is the bellow itself. A visual inspection may reveal cracks, tears, or holes in the rubber or plastic. Once the bellow is compromised, the strut it protects is living on borrowed time. Symptoms of the resulting strut failure include:
- Clunking or Knocking Noises: When the strut wears out, it can cause metal-to-metal contact, especially when driving over bumps.
- Poor Ride Quality: You may notice your Forester feels excessively bouncy, sways or rolls during turns, or “nose-dives” when you brake hard.
- Fluid Leaks: A torn bellow allows debris to destroy the strut's seal, causing hydraulic fluid to leak down the side of the strut body.
- Uneven Tire Wear: A failing suspension can lead to cupping or scalloping patterns on your tires.
A Torn Bellow Guarantees Strut Failure
A strut bellow is a wear item, but it's not one to ignore. Once it tears, it's only a matter of time before the exposed strut shaft is damaged and the entire strut assembly requires replacement. Replacing a $20 bellow today can prevent a $400+ strut replacement job down the road.
Choosing the Right Aftermarket Bellows
For the 1998-2002 Forester, you have a few good options. It's important to understand the difference in quality, as this small part protects a much more expensive component.
Brand Tiers
- OEM-Equivalent (Best Quality): Brands like KYB are often the original equipment manufacturer for Subaru. Choosing a KYB aftermarket bellow kit means you are getting a part with the same or better quality and fit as the one that came on your Forester from the factory. They are a trusted, reliable choice.
- Standard Aftermarket (Good Quality): Brands like Monroe also offer quality replacement kits that are a dependable option and widely available.
- Budget (Economy): Lesser-known brands, such as Skyward, are available at a lower price point. While functional, their long-term durability and material quality may not match that of premium brands. They can be a viable option for budget-conscious repairs, but the risk of premature failure is higher.
Pro Tip: Replace the Entire Strut Assembly
To replace just the bellow, the entire strut assembly must be removed from the vehicle and disassembled. This requires a dangerous tool called a spring compressor. For many DIY mechanics, a safer and often easier option is to replace the entire strut assembly (which includes a new strut, spring, mount, and bellow). If your struts have over 80,000 miles, they are likely nearing the end of their life anyway.
Cost of Replacing Strut Bellows (1998-2002 Forester)
| Part Type | Estimated Part Cost (Per Pair) | Estimated Shop Labor Cost |
|---|---|---|
| New OEM Bellows | $35 - $50 | $300 - $750 |
| New Aftermarket Bellows (KYB/Monroe) | $40 - $65 | |
| New Aftermarket Bellows (Budget) | $20 - $40 |
Note: Labor costs are for replacing bellows only, which requires full strut disassembly. Costs can vary significantly based on location and shop rates. Replacing the complete strut assembly often has similar labor costs.
Frequently Asked Questions
Do I have to replace bellows in pairs?
Yes. Suspension components should always be replaced in pairs (both front or both rear) to ensure even handling and performance. If one bellow has failed due to age, the other is likely not far behind.
Is a wheel alignment necessary after replacing strut bellows?
Yes. Any time the strut is unbolted from the steering knuckle, it affects the wheel alignment. A four-wheel alignment is highly recommended after this job to prevent uneven tire wear and ensure proper handling.
What is the foam part inside the bellow?
That is the jounce bumper, or bump stop. It is made of a dense polyurethane foam and acts as a final cushion to prevent the metal parts of your suspension from crashing into each other during a severe bump. This protects both the strut and the vehicle's frame.
Were there any recalls for 1998-2002 Forester strut bellows?
No. There are no recalls or specific Technical Service Bulletins (TSBs) from Subaru for suspension strut bellows on the 1998-2002 Forester. However, this generation is known for potential rust issues with the front lower control arms, which should be carefully inspected during any suspension work.
Technical Specifications
OEM Part Numbers: 20372AA001
Kit typically includes one bellow (boot) and one internal jounce bumper (bump stop). Made from flexible rubber or polyurethane.
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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.
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