How to Install Control Arms on a Mercedes AMG

Replacing the control arms on your Mercedes AMG is a critical task that restores its world-class handling and ensures your vehicle performs at its best. Whether you’re dealing with wear and tear or upgrading your suspension system, this guide provides a step-by-step approach tailored specifically to Mercedes AMG models.

Step 1: Prepare for the Job

Tools and Equipment

To perform this job efficiently, you’ll need:

• Hydraulic floor jack and jack stands
• Lug wrench
• Socket and wrench set
• Torque wrench
• Ball joint separator
• Pry bar
• Safety gloves and eye protection

Workspace

• Park your AMG on a flat, stable surface.
• Ensure you have sufficient lighting and space to work around the suspension system.

Step 2: Secure the Vehicle

1. Engage the Parking Brake: Prevent movement during the repair.
2. Lift the Vehicle: Using a hydraulic jack, elevate the car at the recommended lifting points.
3. Install Jack Stands: Place them securely under the chassis for stability.

Step 3: Remove the Wheels

Use a lug wrench to loosen and remove the wheel bolts. Carefully set the wheels aside to expose the suspension components, including the control arms.

Step 4: Identify the Control Arm Configuration

Mercedes AMG models often feature a double-wishbone or multi-link suspension system. Locate the upper and lower control arms, noting their connections to:

• The chassis
• The steering knuckle
• The suspension strut assembly

Step 5: Remove the Old Control Arm

Loosen the Ball Joint

1. Remove the cotter pin (if present) from the ball joint.
2. Loosen the nut securing the ball joint to the steering knuckle but do not remove it completely.
3. Use a ball joint separator or pry bar to disconnect the ball joint from the knuckle.

Detach the Control Arm Bolts

1. Locate the bolts connecting the control arm to the chassis and subframe.
2. Carefully remove these bolts, supporting the arm to prevent it from falling unexpectedly.

Extract the Control Arm

Once all connections are loosened, maneuver the control arm out of its position. Be cautious of nearby suspension components to avoid accidental damage.

Step 6: Install the New Control Arm

Align the New Control Arm

• Compare the new control arm with the old one to ensure compatibility.
• Position it in place, aligning the mounting points with the chassis and suspension system.

Reattach the Bolts

1. Insert the bolts and secure them by hand to hold the control arm in place.
2. Use a torque wrench to tighten the bolts to the manufacturer’s specifications.

Connect the Ball Joint

• Reattach the ball joint to the steering knuckle.
• Insert the securing nut and tighten it. If a cotter pin is required, reinstall it at this stage.

Step 7: Reassemble the Suspension

Reinstall the Wheels

1. Position the wheels back onto the hubs.
2. Insert the wheel bolts and tighten them in a star pattern for even pressure distribution.

Lower the Vehicle

1. Remove the jack stands.
2. Gently lower the car to the ground using the hydraulic jack.

Step 8: Final Adjustments and Testing

Torque Check

Use a torque wrench to double-check all fasteners, ensuring they are tightened to the recommended settings.

Professional Alignment

Replacing control arms alters suspension geometry. Schedule a professional wheel alignment to restore optimal handling and tire wear.

Test Drive

Take the AMG for a controlled test drive. Listen for unusual noises and pay attention to handling.

Maintenance Tips

• Regular Inspections: Periodically check the control arms and suspension components for signs of wear or damage.
• OEM or Quality Aftermarket Parts: Always use high-quality components that match the Mercedes AMG’s performance standards.
• Follow Manufacturer Guidelines: Adhere to recommended torque specs and installation procedures for safety and performance.

Installing control arms on a Mercedes AMG is a meticulous process, but with the right tools and patience, it’s achievable. By following this guide, you’ll restore your vehicle’s exceptional handling and maintain the precision driving experience that AMG is renowned for.