BOSCH KS01000840 Rack Pinion

( Brand: Bosch ), ( Manufacturer Part Number: KS01000840 ), ( Type: Rack And Pinion Assembly ), ( Item Length: 53.100 )

Review BOSCH Rack And Pinion Assembly Audi fits QUATTRO A6 1999–2004

The **Bosch KS01000840 Rack and Pinion Assembly** is a precision-engineered component designed exclusively for the **1999 through 2004 Audi A6 Quattro** models equipped with the **4.2L V8 engine**, ensuring optimal steering performance, durability, and reliability. This high-quality aftermarket replacement is meticulously crafted to meet or exceed OEM specifications, delivering seamless steering response and enhanced handling for your vehicle. The rack and pinion system is a critical part of the steering mechanism, converting the rotational motion from the steering wheel into lateral movement for the wheels, and Bosch s version is built with robust materials, including corrosion-resistant coatings and reinforced internal components, to withstand the rigors of daily driving, harsh weather conditions, and extended use. The assembly features a **ball-screw drive mechanism**, which provides smooth, precise, and responsive steering with minimal play, reducing the effort required to turn the wheel while maintaining stability at high speeds. Additionally, the rack is designed with **integrated dust boots** to protect the internal components from debris, moisture, and contaminants, prolonging the lifespan of the assembly and reducing the likelihood of premature wear or failure. Whether you re restoring a classic A6 Quattro or upgrading an existing vehicle, this Bosch part is a trusted choice for enthusiasts and mechanics alike, offering a perfect balance of performance, durability, and compatibility. Proper installation requires careful alignment and calibration to ensure the steering system functions correctly, but the result is a noticeable improvement in steering feel, reduced road noise, and enhanced overall driving dynamics.

### Pros and Cons of buying a Bosch KS01000840 Rack and Pinion for a 1999 2004 Audi A6 Quattro

1. **OEM Quality and Fitment** The Bosch KS01000840 is an original equipment (OEM) or direct replacement part designed specifically for the 1999 2004 Audi A6 Quattro. This ensures a precise fit without modifications, reducing the risk of alignment or handling issues.

2. **Durability and Performance** Bosch is a well-regarded manufacturer known for producing high-quality steering components. This rack and pinion is built to last, offering smooth operation and reliable performance, especially in the A6 s sporty handling environment.

3. **Compatibility with Aftermarket Upgrades** If you plan to install larger wheels, lower suspension, or other modifications, a high-quality rack like this one can better handle the increased stress without binding or premature wear.

4. **Warranty and Support** Bosch parts often come with manufacturer warranties, providing peace of mind against defects. Additionally, they are widely available through reputable dealers and online retailers, making repairs or replacements easier if needed.

5. **Reduced Play and Improved Feedback** A well-maintained rack and pinion enhances steering precision, which is particularly noticeable in the A6 s sport-tuned suspension setup. This can improve driver confidence and responsiveness.

6. **Prevents Leaks and Contamination** The sealed design of Bosch racks minimizes the risk of power steering fluid leaks, which can contaminate the steering system or require frequent top-ups.

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1. **Cost** While not excessively expensive, the Bosch KS01000840 is a premium part compared to generic or aftermarket alternatives. Installation labor (if not DIY) can also add to the total expense, making it a significant upfront investment.

2. **Installation Complexity** Replacing a rack and pinion on an A6 Quattro requires removing the steering column, suspension components, and sometimes the wheel well. This is a labor-intensive job that may require professional assistance unless you have mechanical experience.

3. **Potential for Hidden Damage** If the existing rack is seized or damaged internally (e.g., from corrosion or fluid contamination), simply replacing it may not resolve underlying issues. A thorough inspection of the steering linkage, tie rods, and bushings is recommended before purchase.

4. **Limited Customization** Unlike some aftermarket racks designed for performance tuning (e.g., reduced lash or stiffer recirculation balls), the Bosch OEM part is not optimized for aggressive driving. If you seek enhanced steering feel or reduced play, you may need to pair it with additional modifications.

5. **Availability of Alternatives** While Bosch is reliable, other brands (e.g., ZF, Meyle, or TRW) offer comparable parts at slightly lower prices. Some aftermarket racks may also provide slight performance improvements (e.g., reduced steering effort) without sacrificing quality.

6. **Potential for Overkill** If your current rack is functioning well with minimal play or leaks, upgrading may not offer noticeable benefits unless you re addressing a specific failure (e.g., a seized pinion or fluid leak).

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The Bosch KS01000840 rack and pinion is an excellent choice for owners of the 1999 2004 Audi A6 Quattro who prioritize **reliability, precision, and OEM-level performance**. It is ideal for those replacing a failing rack due to leaks, excessive play, or binding, as well as for drivers who want to future-proof their vehicle against wear from modifications. However, the cost and installation demands make it less suitable for casual buyers or those on a tight budget.

If your primary goal is **cost efficiency** and you re comfortable with aftermarket parts, alternatives like the **ZF or Meyle racks** (which are often drop-in replacements) may offer similar performance at a lower price. Conversely, if you re investing in a **high-quality rebuild or performance tuning**, the Bosch part is a strong, long-term solution.

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- Your current rack is leaking, seized, or showing excessive wear.

- You plan to install larger wheels, lower the suspension, or make other modifications that could stress the steering system.

- You value OEM-level durability and want to avoid potential compatibility issues with generic parts.

- You re willing to invest in professional installation or have the mechanical skill to perform the job yourself.

- Your rack is functioning adequately, and you re looking to save money.

- You re open to aftermarket racks that may offer slight performance advantages (e.g., reduced lash) without sacrificing quality.

- You re unsure whether the existing rack is the root cause of steering issues (inspect tie rods, bushings, and fluid condition first).

**Final Note:** Always inspect the steering system thoroughly before purchasing a replacement rack. Check for worn tie rods, bushings, or fluid leaks, as these can affect the performance of even a new rack. If in doubt, consult a trusted mechanic to confirm the need for replacement.

Details:

Bosch KS01000840 Rack and Pinion Assembly For 99-04 Audi A6 Quattro. Pre-Assembled with inner tier rods. Genuine replacement for the OEM part. All accessories hardware.

Intermediate Rack. Bosch uses new original components from the NEW production line in its re-man process to ensure like performance and durability. Updated 10.19.2023. Placing an order outside the US is easy.

Bosch steering racks are remanufactured to the latest specification following OEM standard. Bosch steering systems are formerly know as ZF . Original packaging.

Fits what vehicles: 1999 Audi A6, 1999 2004 A6 Quattro, 2002 -2004. The rack is of original design and not reverse engineered. Steering Rack, Hydraulic Remanufactured.

part #: ks01000840 prices

• $1910.98-$2146.99

specifications steragebo:

• for models: A6, Quattro
• for makes: Audi
• for years: 1999-2004
• brand: Bosch
• mpn: Ks01000840
• type: Rack And Pinion Assembly
• item length: 53.100

seller steragebo:

• city: Hempstead, New York
• rating: 99.6%
• # reviews: 168921

offer steragebo:

• quantity: 4
• started: May 9, 2026
• sold: 0
• options: Ship-to-home
• availability: In Stock

general steragebo:

• Car Truck Parts Accessories > Steering Suspension > Gearboxes, Rack Pinions
• condition: Remanufactured

returns steragebo:

• time: 30 Days
• paid by: Seller
• policy: Returns Accepted

shipping steragebo:

• transit: 4-9 Days
• type: Fixed
• cost: $0.00
• service: Standard
• class: Standard

payments steragebo:

• wallet: Google-pay
• credit card: Diners-club
• other

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