How to Replace BMW E90 Rear Coil Springs?

How to Replace BMW E90 Rear Coil Springs?

Replacing the rear coil springs on a BMW E90 can seem daunting, but with the right tools and a bit of patience, you can perform the task at home. Here’s a step-by-step guide to help you through the process.

1. What tools do I need for this task?

Before starting, gather the following tools:

1. Jack and jack stands
2. Tire iron
3. Socket wrench set
4. Torque wrench
5. Spring compressors
6. A rubber mallet

2. What safety measures should I take?

Safety is crucial when working on a vehicle. Follow these tips:

1. Always work on a flat surface.
2. Use jack stands to secure the vehicle after lifting.
3. Wear safety goggles and gloves to protect yourself.

3. How do I start the replacement process?

Follow these steps to begin replacing the rear coil springs:

1. Park the BMW on a level surface and engage the parking brake.
2. Loosen the rear wheel nuts slightly before jacking up the car.
3. Use the jack to lift the rear of the car and place jack stands under the car for support.
4. Remove the rear wheels using the tire iron.

4. How do I remove the old coil springs?

Once the wheels are off, proceed with the following steps:

1. Locate the shock absorber and disconnect it by removing the bolts at both ends.
2. Remove the lower control arm (if necessary) by unbolting it to gain access to the spring.
3. Next, take the spring compressors and securely attach them to the coil spring.
4. Carefully compress the spring using the compressors until there is enough clearance to remove the spring from the shock assembly.
5. Remove the old coil spring with caution, ensuring the compressors keep it controlled.

5. How do I install the new coil springs?

To install the new coil springs, follow these steps:

1. Take the new coil spring and place it in the same position as the old one.
2. Using the spring compressors, make sure the new spring is seated correctly in the shock assembly.
3. Once it’s in place, gradually release the spring compressors, allowing the spring to expand.
4. Reattach the lower control arm and bolt it securely. Replace the shock absorber and ensure all bolts are tightened properly.

6. How do I finish up the process?

Complete the installation with these final steps:

1. Reinstall the rear wheels and hand-tighten the nuts.
2. Lower the car back to the ground and use the torque wrench to securely tighten the wheel nuts to the manufacturer's specifications.
3. Finally, take the car for a short drive to ensure everything is functioning correctly and listen for any unusual noises.

7. Are there any additional tips for maintenance?

To maintain your new coil springs, consider the following:

1. Regularly check for any signs of wear or damage.
2. Keep the area around the springs clean from dirt and debris.
3. Have the suspension system inspected during routine maintenance to ensure everything is functioning properly.

Replacing the rear coil springs on your BMW E90 can enhance your vehicle's stability and performance. By following these steps and ensuring safety precautions, you can successfully replace the springs and enjoy a smoother ride.