A Guide to the 2005-2011 BMW M5 Rack and Pinion Bellows Kit
Protect your E60 M5's high-performance steering rack by understanding this critical, yet simple, component.
- The primary role of the bellows is to protect the steering rack; a tear will lead to more expensive repairs if ignored.
- If power steering fluid is inside the boot, the steering rack itself is leaking and needs replacement, not just the boot.
- For this part, a quality aftermarket brand like Delphi is a cost-effective alternative to OEM.
- A wheel alignment is strongly recommended after replacing the bellows to ensure proper handling and prevent uneven tire wear.
Symptoms of a Failing Rack and Pinion Bellows Kit
The primary failure of a rack and pinion bellow is physical damage. Look for cracks, splits, or tears in the rubber or plastic. A visual inspection is the best way to diagnose a bad bellow. While the bellow itself won't cause driving symptoms, its failure will lead to other problems. If left unrepaired, contaminants will destroy the inner tie rods and steering rack, leading to more severe symptoms like:
- Power Steering Fluid Leaks: If you see red or pink fluid on the ground or if the bellows are wet, it means the internal seals of your steering rack have failed, likely from contamination that got past a torn boot.
- Clunking or Knocking Noises: When dirt and debris get into the inner tie rod joint, they cause wear. This creates play in the joint, resulting in clunking sounds when turning the wheel.
- Loose or Vague Steering: A worn inner tie rod or steering rack can cause a 'dead spot' on-center or a general feeling of looseness in the steering wheel.
Don't Ignore Torn Boots
A simple torn boot is a minor issue that can be fixed cheaply. Ignoring it will lead to the destruction of the entire steering rack, a much more expensive and labor-intensive repair. Check your bellows during every oil change.
Choosing the Right Aftermarket Bellows Kit
For the E60 M5, you don't need to pay a premium for a Genuine BMW part for a simple component like a steering boot. Quality aftermarket options provide excellent protection at a much lower cost. Your choice depends on your budget and quality preference.
Brand Tiers for Your M5
- Good (Tier 1): Delphi - Delphi is a well-respected OE supplier for many car manufacturers. Their parts are known for quality and durability, often meeting or exceeding original specifications. They are a reliable choice for owners who want a high-quality part without the dealership price tag.
- Acceptable (Tier 2): URO Parts - URO Parts is a budget-friendly brand. For a simple protective part like a bellow, they can be a viable option if cost is your primary concern. However, forum discussions show mixed reviews regarding fit and finish on some of their parts, so be aware that they are not considered a premium brand.
Pro Tip: Get the Kit
Always purchase a bellows "kit." These kits include not only the boot itself but also the necessary clamps for a secure installation. Reusing old, stretched clamps is not recommended and can lead to the boot coming loose.
| Brand | Price Range |
|---|---|
| Delphi | $22 - $31 |
| URO Parts | $16 - $22 |
Frequently Asked Questions (FAQ)
Do I need a wheel alignment after replacing the bellows?
It is highly recommended. The replacement process involves removing the outer tie rod end. While it's possible to mark the threads and count the turns to get it close to the original position, it's not perfectly accurate. A professional alignment will ensure your M5 tracks straight and prevents premature tire wear.
Can I replace just one bellow if only one is torn?
Yes, you can replace only the damaged side. However, since the bellows are made of the same material and have been exposed to the same conditions, the other side is likely to fail soon. Given the low cost of the part, it is often wise to replace both at the same time to save on future labor.
Is it hard to replace the rack and pinion bellows myself?
For an experienced DIY mechanic, this is a manageable job. It requires safely lifting and supporting the vehicle, and you may need a special tool (a pickle fork or ball joint separator) to remove the tie rod end. If you are not comfortable with suspension work, it's best to leave this job to a professional.
My old boot had power steering fluid in it. Will a new boot fix the leak?
No. The bellows are only dust covers. If there is fluid inside the boot, it means the internal seals of the steering rack have failed. Replacing the boot will not stop the leak. The entire steering rack will need to be rebuilt or replaced to fix the problem.
Technical Specifications
OEM Part Numbers: 32106780124 32131096280 32106795340
Kit typically includes two bellows (left and right may differ) and four clamps.
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.
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