MERCEDES 666614-BR172 Power Steering Rack Pinion Benz
fits model: Slc300, Slk350. make: Mercedes. year: 2012–2020.
( Manufacturer Part Number: 666614-BR172 ), ( Type: Rack Pinion ), ( Oe/oem Part Number: 1724600100, A1724600100 ), ( Vintage Part: No ), ( Country Of Origin: Germany )
Review MERCEDES benz Power Steering Rack And Pinion Oem fits SLC300 SLK350 2012–2020
The **Mercedes-Benz 666614-BR172 Power Steering Rack and Pinion Assembly (2012 2020 SLC300/SLK350)** is a precision-engineered hydraulic steering component designed to deliver the effortless, responsive, and refined handling that defines the luxury sports coupe and roadster experience. This high-performance rack and pinion assembly is integral to the vehicle s steering system, ensuring smooth, low-effort turns while maintaining exceptional precision and feedback, even at high speeds. Crafted from durable, corrosion-resistant materials and engineered to Mercedes-Benz s exacting standards, this part is built to withstand the demands of daily driving, spirited performance, and long-term reliability, making it a critical upgrade or replacement for owners seeking to restore or enhance their vehicle s original driving dynamics.
The **BR172 rack and pinion** features a robust hydraulic system with a sealed, leak-proof design, incorporating a recirculating ball mechanism that minimizes friction and maximizes efficiency. The pinion shaft, machined from high-grade steel, is precision-ground to ensure smooth engagement with the rack teeth, reducing play and enhancing steering feel. This assembly is compatible with the **M272 V6 engine** found in the **SLC300 (3.5L V6)** and the **SLK350 (3.5L V6)**, providing the correct torque and steering ratio for optimal handling. Whether restoring a vehicle after a leak or replacing an aging component, this OEM-quality part ensures a seamless fit, maintaining the original steering geometry and performance characteristics that Mercedes-Benz is renowned for.
For technicians and enthusiasts alike, the **666614-BR172** represents a direct replacement that eliminates common issues such as fluid leaks, excessive play, or a spongy steering feel. Its compatibility with the **2012 2020 model years** ensures broad applicability across the SLC300 and SLK350 lineup, including facelifted versions with updated styling cues. The assembly is designed to integrate seamlessly with the vehicle s existing steering column, tie rods, and hydraulic lines, requiring minimal additional modifications. When installed correctly, it restores the car s intended steering response light yet communicative, with minimal effort required for precise control, whether navigating tight city streets or cruising at highway speeds.
Beyond its functional superiority, this power steering rack and pinion assembly underscores Mercedes-Benz s commitment to engineering excellence. The use of high-quality seals, reinforced mounting brackets, and a robust hydraulic pump interface ensures longevity and resistance to environmental factors such as moisture and temperature fluctuations. For owners who prioritize both performance and longevity, this part serves as an ideal solution, bridging the gap between stock reliability and aftermarket enhancements. Whether used in a restoration project or as a proactive replacement, the **666614-BR172** delivers the confidence of knowing that the steering system operates with the same level of precision and refinement as the day the vehicle left the factory.
### **Pros and Cons of Buying a Mercedes-Benz 666614-BR172 (2012 2020 SLC300/SLK350) Power Steering Rack Pinion**
#### **Pros**
1. **Performance and Driving Dynamics**
The SLC300 (V8) and SLK350 (V6) models are known for their engaging driving experiences. The V8 in the SLC300 delivers strong acceleration and a smooth, linear power delivery, while the V6 in the SLK350 offers a more refined, sporty feel with good mid-range torque. Both models feature Mercedes signature driving dynamics, including adaptive dampers (in later models) and precise steering response when the rack and pinion are in good condition.
2. **Luxury and Comfort**
Mercedes-Benz is synonymous with premium interiors, and these models feature high-quality materials, ergonomic seating, and advanced sound insulation. The SLK300/SLK350 (convertible) and SLC300 (coupe) offer a blend of sportiness and comfort, making them ideal for both city driving and road trips.
3. **Reliability of the Core Components**
The **2012 2020 M276 V8 (SLC300)** and **M176 V6 (SLK350)** engines are generally reliable when maintained properly. The V8 is more robust, while the V6 is fuel-efficient and smooth. The **power steering rack and pinion (part #666614-BR172)** is a common failure point, but if you re replacing it, this suggests the rest of the car may still be in decent shape if serviced regularly.
4. **Aftermarket and Customization Potential**
Both models have strong aftermarket support, especially for performance upgrades (e.g., exhaust, suspension, or engine tuning). The SLK s convertible top and the SLC s coupe body make them popular for modifications, though the V8 s weight can limit some high-performance upgrades.
5. **Resale Value and Prestige**
Mercedes-Benz retains its prestige, and these models hold their value better than many competitors. Owning a well-maintained SLC300 or SLK350 carries a certain status, which can be appealing for enthusiasts or collectors.
6. **Convertible Enjoyment (SLK Models)**
The SLK350 s retractable hardtop provides a unique driving experience, combining the thrill of an open-top car with the practicality of a closed cabin. The roof mechanism, while not perfect, is generally reliable in these years.
---
#### **Cons**
1. **High Maintenance Costs**
Mercedes-Benz vehicles, especially luxury models, are expensive to maintain. The V8 in the SLC300 requires more frequent oil changes (every 10,000 miles) and can develop issues like oil leaks or timing chain wear over time. The V6 in the SLK350 is more economical but still requires premium parts and labor.
2. **Common Electrical and Software Issues**
Many Mercedes models from this era suffer from electrical gremlins, including glitches in the infotainment system (MBUX in later models), sensor failures, and intermittent issues with the power steering or other electronics. The **power steering rack and pinion failure** you re addressing is a known problem, often linked to fluid leaks or internal wear, which can lead to a stiff or unresponsive steering wheel.
3. **Power Steering Rack and Pinion Reliability**
The **666614-BR172 rack and pinion** is notorious for failing prematurely, often due to:- **Fluid leaks** (seals or hoses failing).
- **Internal wear** (rack bushings or pinion bearings degrading).
- **Electronic issues** (steering angle sensor or hydraulic pump failures).
Replacing it is a significant expense (often $1,500 $3,000 installed), and if the car has other neglected issues (e.g., timing chain, suspension), this could be a red flag.
4. **Fuel Economy Trade-offs**
While the SLK350 is more efficient than the SLC300, neither is particularly economical. The V8 in the SLC300 averages around **16 18 MPG combined**, while the V6 in the SLK350 does slightly better at **22 25 MPG**. For daily driving, this can add up in fuel costs.
5. **Convertible Practicality (SLK Models)**
The SLK s open-top design means less protection from weather, road debris, or noise. The roof mechanism can also be finicky, requiring occasional lubrication and potential repairs. Storage space is limited compared to a coupe or sedan.
6. **Depreciation and Market Saturation**
Mercedes-Benz luxury cars depreciate quickly, and the SLC300/SLK350 segment is competitive. While these models retain value better than some, they are not as sought-after as newer or more exotic Mercedes (e.g., AMG models or the GLE). This means resale values may not recover the initial purchase price.
7. **Potential Hidden Issues**
If the car has a history of poor maintenance, you may encounter:- **Timing chain stretch or tensioner failure** (common in the M276 V8).
- **Suspension wear** (struts, bushings, or control arms).
- **Exhaust or emissions system issues** (especially in the SLK350, which may require EGR or DPF attention).
- **Transmission problems** (the 7G-Tronic automatic is generally reliable but can develop delays or rough shifts if neglected).
---
#### **Ending Conclusion**
Buying a **2012 2020 Mercedes-Benz SLC300 or SLK350 with a failing power steering rack and pinion (666614-BR172)** can be a rewarding experience if you prioritize driving enjoyment, luxury, and are prepared for the associated costs. The V8 in the SLC300 offers brute strength and a thrilling ride, while the V6 in the SLK350 provides a more balanced, efficient sporty experience. However, the **high maintenance costs, electrical quirks, and potential for other neglected issues** make this a car best suited for:
- **Enthusiasts who enjoy working on or maintaining their own vehicles.**
- **Those with a budget to handle unexpected repairs.**
- **Owners who value the driving experience and prestige over long-term cost efficiency.**
If you re not mechanically inclined or cannot afford the potential repair bills, this may not be the best purchase. Alternatively, if you re buying used, **prioritize a car with a full service history, no timing chain issues, and a recently replaced rack and pinion** to mitigate risks.
---
#### **Recommendation**
1. **If You re Set on This Model:**- **Get a pre-purchase inspection (PPI) from a Mercedes specialist** to check for timing chain wear, suspension health, and electrical issues.
- **Verify the power steering rack and pinion replacement was done professionally** and that the car has been driven since the repair.
- **Budget for at least $5,000 $10,000/year in maintenance** to account for potential surprises.
- **Consider the SLK350 over the SLC300** if fuel efficiency and lower maintenance costs are priorities, though the V8 s power is undeniable.
2. **If You re Hesitant:**- **Explore newer Mercedes models** (e.g., CLA-Class, AMG GT, or GLE) if your budget allows, as they offer better reliability and modern tech.
- **Look for alternative luxury sports cars** (e.g., BMW M2, Audi S5, or Porsche 718) that may have lower long-term costs.
- **Consider a used AMG model** (e.g., SLK 55 AMG) if you want more power and a more reliable V8 option.
3. **If You re Buying Used:**- **Avoid models with excessive mileage (>100,000 miles) without a full service record.**
- **Check for recalls or technical service bulletins** related to the rack and pinion or other components.
- **Negotiate aggressively** these models often sell for less than their true value due to known issues.
Ultimately, this is a **great car for the right owner**, but it demands respect and a willingness to invest in its upkeep. If you re prepared for that, the SLC300 or SLK350 can be an incredible driving machine. If not, there may be better alternatives.
Details:
With OE/OEM part numbers and A, this rack pinion is a reliable durable option for maintaining the performance handling of your Mercedes-Benz. The product is a genuine OEM Mercedes-Benz power steering rack and pinion, specifically designed for the 2012 2020 Mercedes SLC300 SLK350 model's. Made in Germany, this part is a perfect fit for those looking high-quality steering components their vehicle.
part #: 666614br172 prices
- $130.00-$511.01
specifications steragebo:
- for models: Slc300, Slk350
- for makes: Mercedes
- for years: 2012-2020
- mpn: 666614-br172
- type: Rack Pinion
- oe/oem part number: 1724600100, A1724600100
- vintage part: No
- country of origin: Germany
offer steragebo:
- sold: 0
- availability: In Stock
- options: Ship-to-home
- started: May 14, 2026
- quantity: 1
returns steragebo:
- time: 30 Days
- paid by: Buyer
- policy: Returns Accepted
shipping steragebo:
- transit: 4-8 Days
- class: Economy
- service: Economy
- type: Fixed
- cost: $0.00
payments steragebo:
- wallet: Google-pay
- other
- credit card: Discover
seller steragebo:
- city: Saint Augustine, Florida
- rating: 99.3%
- # reviews: 5207
general steragebo:
- Car Truck Parts Accessories > Steering Suspension > Gearboxes, Rack Pinions
- condition: Used
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