LEMFÖRDER 35688 01 Track Control Arm For Audi A4 / S4

Overview of the Component

The Lemforder 35688 01 Track Control Arm is a high‑performance suspension element designed for the Audi A4 (8K, B8) and related models such as the A5, A6, A7, Q5 and their various body styles (Avant, Allroad, Sportback). It serves as the upper wishbone of the front axle, connecting the steering knuckle to the chassis and providing precise control over wheel motion during acceleration, braking, and cornering.

Key Functionalities

• Wheel Alignment Control: Maintains the correct camber, caster and toe angles throughout suspension travel.
• Load Distribution: Transfers longitudinal forces from the steering system to the chassis, reducing flex and improving handling.
• Durability: Constructed from high‑strength steel with a hardened surface finish to resist fatigue and corrosion.
• Compatibility: Fits the original factory mounting points and bolt patterns for both left‑hand drive (LHD) and right‑hand drive (RHD) vehicles.

Engineering Design Features

The arm incorporates a triangular wishbone geometry, which offers optimal stiffness while allowing for the necessary articulation. The design includes:

• Pre‑loaded bushings: Reduce play and improve steering feel.
• Integrated mounting brackets: Simplify installation by aligning with existing chassis points.
• Heat‑treated steel: Enhances resistance to high temperatures generated during aggressive driving.
• Surface coating: Anti‑corrosion paint protects against road salts and environmental exposure.

Installation Process

Replacing the stock control arm with the Lemforder 35688 01 is a straightforward procedure for experienced mechanics:

1. Lift the vehicle and secure it on jack stands.
2. Remove the wheel and brake components to access the steering knuckle.
3. Detach the existing control arm by loosening the mounting bolts and removing the bushings.
4. Install the new arm, aligning it with the chassis mounting points and securing it with the supplied bolts.
5. Reinstall bushings and torque all fasteners to the manufacturer’s specifications.
6. Reassemble wheel and brake components, then lower the vehicle.
7. Perform a wheel alignment to ensure optimal handling characteristics.

Performance Benefits

Upgrading to the Lemforder 35688 01 Track Control Arm delivers noticeable improvements in:

• Handling Precision: Reduced body roll and tighter steering response.
• Brake Stability: Improved weight transfer during hard braking, enhancing stopping power.
• Ride Comfort: Balanced suspension travel reduces harshness over uneven road surfaces.
• Longevity: Higher fatigue resistance extends the life of the suspension system.

Compatibility Matrix

Material and Finish Details

The arm is fabricated from high‑strength alloy steel (ASTM A572 Grade 5), then subjected to a heat‑treatment process that increases its tensile strength. The final surface is coated with a powder‑coated layer, providing both aesthetic appeal and protection against corrosion.

Maintenance Tips

• Inspect the arm and bushings for wear or damage after every 10,000 miles.
• Check bolt torque values periodically to ensure secure mounting.
• Avoid over‑tightening, which can lead to bolt failure or arm distortion.
• Replace bushings if they become soft, cracked, or exhibit excessive play.

Conclusion

The Lemforder 35688 01 Track Control Arm is a premium, factory‑compatible replacement that enhances the dynamic performance of Audi front‑wheel suspension systems. Its robust construction, precise geometry, and ease of installation make it an ideal choice for enthusiasts seeking improved handling without compromising reliability.