Lemforder 2509402 Suspension Control Arm

Lemforder 2509402 Suspension Control Arm

The Lemforder 2509402 is a high‑performance suspension component designed to replace the original control arm on selected Mercedes-Benz models, particularly the S-Class (W140) from 1991–1998. It also fits a range of other vehicles that share similar chassis geometry and mounting points.

Key Features

• Precision Engineering: Manufactured with tight tolerances to match the original part’s specifications, ensuring optimal handling and ride quality.
• Durable Construction: Made from high‑strength steel alloy that resists fatigue and corrosion over long service life.
• Improved Geometry: Designed to maintain correct camber and toe angles during suspension travel, enhancing tire contact patch and reducing uneven wear.
• Easy Installation: Comes with all necessary mounting hardware and clear instructions for a straightforward swap.

Material Composition

The control arm is fabricated from high‑grade alloy steel (ASTM A572 Grade 5), which offers a balance of strength, toughness, and weldability. The component undergoes a phosphate coating process to provide additional corrosion resistance in harsh environments.

Compatibility Overview

The Lemforder 2509402 is engineered for the following vehicle families:

• Mercedes-Benz S-Class (W140) – rear lower control arm, both left and right sides, for models produced between 1991 and 1998.
• Other Mercedes-Benz chassis that share identical mounting brackets and bolt patterns, such as certain E-Class and C-Class variants with similar suspension geometry.
• International equivalents – the part is also marketed under different names (e.g., “Stange/Strebe”, “Biellette de barre stabilisatrice”) in European markets, but the underlying specifications remain identical.

Installation Procedure

1. Preparation: Secure the vehicle on a lift or jack stands. Remove the wheel and disconnect the brake caliper to access the control arm mounting points.
2. Removal of Original Arm: Loosen the mounting bolts with an impact driver, then carefully detach the old control arm from the subframe and steering knuckle.
3. Alignment Check: Verify that the new Lemforder 2509402 matches the original in length and offset. Use a straightedge or laser alignment tool if necessary.
4. Mounting: Position the new control arm onto the subframe, aligning all mounting holes. Tighten bolts to the manufacturer’s specified torque sequence (typically 80–100 Nm).
5. Reassembly: Reinstall the steering knuckle, brake caliper, and wheel. Double‑check all fasteners for proper torque.
6. Final Test: Lower the vehicle, perform a short drive to ensure smooth operation, and inspect for any abnormal noises or vibrations.

Performance Benefits

• Enhanced Handling: The precise geometry of the Lemforder 2509402 maintains optimal tire alignment during cornering, reducing body roll and improving steering feel.
• Longer Component Life: The alloy steel construction resists bending and cracking under high load conditions, extending the service interval compared to some aftermarket alternatives.
• Consistent Ride Quality: By preserving the original suspension characteristics, drivers experience a familiar ride height and comfort level without compromising safety.

Maintenance Tips

Although the control arm is designed for durability, regular inspections are recommended:

• Check bolt torque every 10,000 km or after any major impact event.
• Inspect for signs of corrosion or paint damage; touch up with rust‑preventive primer if needed.
• Ensure that the steering linkage remains free of play and that the suspension bushings are in good condition.

Technical Specifications

Conclusion

The Lemforder 2509402 Suspension Control Arm delivers a reliable, high‑quality replacement for the original rear lower control arm on selected Mercedes-Benz models. Its precise engineering, robust material selection, and straightforward installation make it an excellent choice for enthusiasts seeking to maintain or restore their vehicle’s suspension integrity without compromising performance.