MERCEDES 166-540-56-09 Rear Brake Caliper Wiring Harness Rh Lh Benz

( Manufacturer Part Number: 166-540-56-09 ), ( Type: Brake Caliper Wiring Harness ), ( Items Included: Pair ), ( Features: Brake Caliper Wiring Harness Rh Lh ), ( Placement On Vehicle: Left, Lower, Rear, Right )

Review MERCEDES benz Ml Class Rear Brake Caliper Wiring Harness Rh And Lh Pair Oe fits GL 2006–2019

The **Mercedes-Benz 166-540-56-09 GL Rear Brake Caliper Wiring Harness (Right-Hand Side, Left-Hand Side, 2006 2019)** is a precision-engineered electrical component designed to ensure seamless integration between the brake caliper assembly and the vehicle s anti-lock braking system (ABS) and electronic stability control (ESC) networks. This high-quality wiring harness is specifically tailored for Mercedes-Benz models spanning the years 2006 through 2019, covering a wide range of luxury sedans, SUVs, and coupes, including the E-Class, C-Class, GLK, ML, and R-Class series. Crafted from durable, corrosion-resistant materials, the harness features meticulously routed and heat-shrink-wrapped wiring to prevent chafing, moisture ingress, and signal interference, guaranteeing long-term reliability even under demanding driving conditions. The harness incorporates a robust connector system that securely interfaces with the brake caliper s sensor module, facilitating precise data transmission between the wheel speed sensor and the vehicle s ABS control unit. This ensures optimal braking performance, adaptive traction control, and enhanced safety features, all of which are critical for the performance and luxury expectations of Mercedes-Benz owners. Whether installed during routine maintenance, a brake system upgrade, or a repair following an accident, this harness is engineered to meet OEM specifications, ensuring a perfect fit and seamless functionality without the risk of electrical malfunctions or signal loss. Its universal compatibility across multiple model years and body styles makes it an indispensable replacement part for mechanics and DIY enthusiasts alike, offering both convenience and peace of mind.

### **Pros and Cons of buying a Mercedes-Benz 166-540-56-09 GL Rear Brake Caliper Wiring Harness (RH/LH, 2006-2019)**

1. **Direct Fitment** This part is specifically designed for the 2006-2019 Mercedes-Benz GL series, ensuring compatibility without modifications. It includes both right-hand (RH) and left-hand (LH) options, covering both rear calipers.

2. **OEM Quality** As an original equipment manufacturer (OEM) part or a high-quality aftermarket equivalent, it should meet Mercedes-Benz s engineering standards, providing reliable performance and durability.

3. **Pre-Wired and Assembled** The wiring harness is pre-connected to the caliper, simplifying installation. This reduces the risk of wiring errors and ensures proper functionality of the brake system s electrical components, such as the brake light switch and ABS sensor.

4. **Prevents Common Issues** Many brake-related problems in older Mercedes models stem from faulty wiring or loose connections. Replacing the harness can resolve intermittent brake light failures, ABS codes, or erratic brake performance.

5. **Cost-Effective Alternative to Full Caliper Replacement** If only the wiring harness is failing (rather than the entire caliper), replacing just this component is far cheaper than buying a new caliper assembly.

6. **Easy Installation** Since it s a modular component, replacing it typically requires only basic tools and does not involve major disassembly of the brake system.

7. **Warranty Coverage** Reputable sellers (such as those on Amazon, RockAuto, or Mercedes-Benz approved suppliers) often provide warranties, offering peace of mind against defects.

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1. **Potential Counterfeit Risk** Some aftermarket parts, especially those from untrusted sellers, may be counterfeit or low-quality. This could lead to premature failure or poor fitment, voiding warranties or causing further damage.

2. **Limited Availability of OEM Parts** While this part is widely available, OEM genuine Mercedes-Benz parts can be expensive compared to aftermarket alternatives. Buyers must weigh cost against quality.

3. **Mismatched Stock** If the part is not sourced from a reliable supplier, there s a chance it may not match the exact wiring or mechanical specifications of the vehicle, leading to compatibility issues.

4. **Additional Labor Costs** Even though installation is straightforward, some buyers may need to pay a mechanic for labor, especially if they lack experience with brake system repairs.

5. **Hidden Damage** If the caliper itself is worn or damaged (e.g., rusted pistons, warped rotors), replacing just the wiring harness may not fully resolve brake issues. A thorough inspection is recommended before purchase.

6. **Return Difficulties** Once installed, returning the part for a refund or exchange can be challenging, particularly if the buyer is unsure about the quality upon receipt.

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The **Mercedes-Benz 166-540-56-09 GL rear brake caliper wiring harness (RH/LH, 2006-2019)** is a practical and cost-effective solution for addressing wiring-related brake system failures in this model range. Its direct fitment, pre-wiring, and ability to prevent common electrical issues make it a strong choice for DIYers and mechanics alike. However, buyers must ensure they purchase from a reputable seller to avoid counterfeit or mismatched parts. If the caliper itself is degraded, a full caliper replacement may be necessary alongside the harness.

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1. **Verify the Seller** Purchase from well-known suppliers (e.g., Amazon, RockAuto, or authorized Mercedes-Benz parts dealers) with positive reviews and clear return policies. Avoid overly cheap listings that may indicate counterfeit goods.

2. **Check for Compatibility** Confirm that the part number (166-540-56-09) matches your specific GL model year and variant (e.g., GL 350, GL 550). Some trims may require slight adjustments.

3. **Inspect the Caliper First** Before buying, inspect the caliper for physical damage (e.g., rust, leaks, or seized pistons). If the caliper is worn, consider replacing it alongside the harness for long-term reliability.

4. **Follow Installation Guidelines** Refer to a Mercedes-Benz service manual or trusted online guides (e.g., Haynes or Chilton) for step-by-step installation. Proper installation ensures the harness functions correctly and avoids future issues.

5. **Consider a Warranty** Opt for a part with at least a 12-month warranty to protect against defects. Some aftermarket brands offer extended coverage.

6. **DIY vs. Professional Installation** If comfortable with brake work, installing the harness yourself will save labor costs. Otherwise, consult a Mercedes-Benz specialist to ensure proper fitment and testing.

**Final Verdict:** This part is highly recommended for addressing wiring-related brake problems in the specified GL models, provided it is sourced responsibly and installed correctly. For best results, pair it with a thorough brake system inspection.

Details:

Interior Color: Gray. Rear Brake Caliper Wiring Harness RH LH Pair, Part Numbers: 166-540-56-09, 166-540-57-09, For: 2006 2019 Mercedes GL ML Class OEM, Donor Vehicle Information. Items may show light scuffs, scratches or other imperfections as a result of this being used part. Engine: 5.5L 8 Cl Gas Injected Supercharged 493hp.

137,271 miles on it. Address available upon request. Multi quantity items may have small cosmetic differences, but not functionally or structurally different from what you see in the pictures. This item was taken off.

Made in Germany. 2008 MERCEDES-BENZ G55 AMG. All parts are in good working condition and were tested before removal from the vehicle. Item Condition.

part #: 1665405609 prices

• $35.88-$72.00

specifications parkingbrakecablesaz:

• for models: Gl
• for makes: Mercedes
• for years: 2006-2019
• mpn: 166-540-56-09
• type: Brake Caliper Wiring Harness
• items included: Pair
• features: Brake Caliper Wiring Harness Rh Lh
• placement on vehicle: Left, Lower, Rear, Right

shipping parkingbrakecablesaz:

• type: Fixed
• cost: $10.00
• transit: 4-7 Days
• class: Standard
• service: Standard

seller parkingbrakecablesaz:

• rating: 99.2%
• # reviews: 12077
• city: Jacksonville, Florida

returns parkingbrakecablesaz:

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

general parkingbrakecablesaz:

• condition: Used
• Car Truck Parts Accessories > Brakes Brake Parts > Brake Cables

offer parkingbrakecablesaz:

• started: February 5, 2026
• options: Ship-to-home
• quantity: 1
• availability: In Stock
• sold: 0

payments parkingbrakecablesaz:

• wallet: Apple-pay
• other
• credit card: Visa

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