Lemforder 1308602 Suspension Control Arm

Overview of the Lemforder 1308602 Suspension Control Arm

The Lemforder 1308602 is a high‑performance suspension control arm, also known as a wishbone or track control arm. Designed for the BMW 5 Series (E39) and its Alpina variants, this component plays a critical role in maintaining wheel alignment, handling stability, and overall ride quality.

Key Functional Role

The control arm connects the vehicle’s wheel hub assembly to the chassis. It allows the wheel to move up and down while restricting unwanted lateral or longitudinal motion. By doing so, it preserves the intended geometry of the suspension system, ensuring:

• Accurate camber and caster angles
Consistent tire contact patch during cornering Reduced wear on steering components Improved vehicle stability at high speeds

Design & Construction

The 1308602 is engineered with a high‑strength aluminum alloy, offering an optimal balance between durability and weight savings. The arm features:

• Precision machined mounting points that match OEM specifications.
Integrated rubber bushings (optional) to dampen vibrations and isolate the chassis from road noise. Corrosion‑resistant surface treatment for long‑term reliability in varied climates.

Compatibility Matrix

This control arm is specifically tailored for:

• BMW 5 Series (E39) – 1995 to 2003 models.
Alpina B10 and D10 variants of the E39 platform. All wheel positions: front left, front right, rear left, rear right.

Installation Guide

Replacing a control arm is a task that requires mechanical skill. The following steps outline a typical installation procedure for the Lemforder 1308602. Always consult your vehicle’s service manual before proceeding.

Tools & Materials Needed

• Jack and jack stands
Socket set (including 10mm, 12mm, and 14mm sockets) Torque wrench with a range of 30–70 Nm Steering wheel lock or steering stabilizer to prevent rotation during work. Replacement bushings (if applicable).

Step‑by‑Step Procedure

1. Secure the vehicle: Raise the car with a jack, place it on sturdy jack stands, and lock the wheels.
2. Remove the wheel to access the suspension components.
3. Detach the existing control arm by loosening the mounting bolts that attach it to the chassis and the steering knuckle. Keep track of bolt sizes and positions.
4. Inspect the mounting points for wear or damage; replace any compromised parts.
5. Position the new Lemforder 1308602, aligning its mounting holes with those on the chassis and knuckle.
6. Tighten the bolts in a crisscross pattern to ensure even load distribution. Use the torque wrench to achieve the manufacturer’s specified torque values.
7. Reinstall the wheel and lower the vehicle.
8. Test drive at low speeds to confirm proper alignment and absence of abnormal noises.

Performance Benefits

Choosing the Lemforder 1308602 over generic aftermarket parts delivers several tangible advantages:

• Enhanced Handling: Precise geometry reduces body roll and improves cornering grip.
Longer Component Life Reduced Road Noise Consistent Tire Wear Patterns Compatibility with OEM suspension tuning

Maintenance & Inspection Tips

Regular checks help maintain optimal performance:

• Inspect bushings annually for signs of wear or cracking.
Check bolt torque every 10,000 km (or as recommended by the manufacturer). Look for any unusual vibrations or noises during driving; these may indicate a loose arm or damaged bushing.

Frequently Asked Questions

Is the Lemforder 1308602 compatible with all BMW 5 Series models?

No. It is specifically designed for the E39 generation (1995‑2003), including Alpina B10 and D10 variants.

Can I use this control arm on a rear axle?

The part is available in both front and rear configurations. Ensure you select the correct side (left/right) and position (front/rear).

What is the expected lifespan of the 1308602?

With proper installation and maintenance, it can last well beyond the original OEM component’s life, often exceeding 150,000 km.

Does this part affect vehicle alignment?

Yes. Because it defines key suspension geometry, any change requires a post‑installation wheel alignment to maintain optimal handling.

Conclusion

The Lemforder 1308602 Suspension Control Arm is engineered for precision, durability, and performance. Whether restoring an older BMW 5 Series or upgrading its suspension dynamics, this component delivers the reliability expected from a premium aftermarket part while preserving the vehicle’s original handling characteristics.