A Practical Guide to the 2000-2007 Audi TT Quattro Suspension Strut Bellows
Protect your Audi's performance by understanding this critical, often overlooked suspension part.
- A torn strut bellow is a minor issue that becomes a major, expensive repair if ignored.
- Replacing a bellow requires full disassembly of the strut with dangerous spring compressors; this is a job for a professional.
- Always replace the foam bump stop with the bellow, and perform the service in pairs (both fronts or both rears).
- An alignment is necessary after the job is complete to prevent tire wear and handling issues.
Is Your Audi TT's Ride Suffering? Check the Strut Bellows.
If you own a first-generation (Mk1) Audi TT Quattro, you know it's a car that rewards a well-maintained suspension. One of the simplest yet most important parts in that system is the suspension strut bellow, or dust boot. This flexible, accordion-like cover protects the strut's piston shaft. When it tears, it exposes the strut to damaging debris, which will ruin the strut over time. Ignoring a cheap, torn bellow will eventually lead to a costly and complex strut replacement.
Symptoms of a Failing Strut Bellow
The initial symptom is purely visual. You or your mechanic will see that the boot is cracked, ripped, or missing entirely. There will be no sound or change in ride quality from the torn boot itself. However, if left alone, the strut it was protecting will fail. Symptoms of a failed strut include:
- A bouncy, uncontrolled ride.
- Clunking or knocking noises when driving over bumps.
- The front end “diving” forward during braking.
- Uneven tire wear, often called “cupping”.
- Visible oil leaking down the side of the strut body. 🎬 Watch: How to diagnose a bad strut or shock
Choosing the Right Aftermarket Bellows: KYB vs. Skyward
For a part like a strut bellow, you don't necessarily need to pay the high price for a Genuine Audi part. Aftermarket options offer good quality for much less money. Your choice often comes down to a balance of price and brand reputation.
- KYB: KYB is a major, well-respected manufacturer of suspension components worldwide. Their parts are known to be a reliable, quality alternative to OEM. While some forum users have mixed opinions on the ride stiffness of their full strut assemblies, their individual components like bellows are considered a safe and durable choice.
- Skyward: Skyward is a budget-friendly brand. While information from owner forums is limited, it represents a value-tier option for those on a tighter budget. The main risk with a budget part is potentially less durable material, which might crack or fail sooner than a part from a more established brand.
Known Issues, Recalls, or TSBs
Searches of National Highway Traffic Safety Administration (NHTSA) records and Technical Service Bulletins (TSBs) show no specific recalls or service actions for the suspension strut bellows on the 2000-2007 Audi TT Quattro. While other suspension recalls exist for different Audi models and years, they do not apply to the bellows on this specific vehicle.
| Part / Service | Estimated Cost (Per Pair) |
|---|---|
| New Aftermarket Bellows (KYB, Skyward) | $20 - $40 |
| New OEM Bellows | $100 - $130 |
| Shop Labor (Requires Strut Disassembly) | $250 - $500 |
Frequently Asked Questions
Do I have to replace the whole strut if just the boot is torn?
No. If you catch it early and the strut is not leaking oil or making noise, you can just replace the bellow and bump stop. This will save your original strut from future damage.
Is this a difficult job to do myself?
Yes, this is an advanced DIY job. It requires removing the entire strut assembly from the vehicle and then using a special tool called a spring compressor to safely disassemble it. Spring compressors can be very dangerous if used incorrectly. For most owners, this job is best left to a qualified mechanic.
🎬 See this walkthrough on replacing front shocksShould I get a wheel alignment after replacing the bellows?
Yes. Any time the front struts are removed from the vehicle, it is highly recommended to perform a wheel alignment. This ensures your tires wear evenly and the vehicle handles as it should.
What happens if I just ignore a torn strut boot?
Ignoring a torn boot will lead to the failure of your strut. Dirt and moisture will destroy the strut's seals, causing the internal fluid to leak out. This turns a sub-$50 part replacement into a repair that can cost hundreds of dollars per corner for a new strut and labor.
Helpful Videos
Technical Specifications
OEM Part Numbers: 357413175A
We Have This Part in Stock
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.
- Audi TT Quattro: