The Subaru Forester's rear suspension is crucial for a smooth and safe ride. Like any car component, it can experience wear and tear. This article dives into common issues, repair options, and upgrade possibilities for your Forester's rear suspension.

Understanding the Subaru Forester Rear Suspension

The rear suspension on your Subaru Forester is designed to provide stability, absorb bumps, and ensure comfortable handling. It's typically a double-wishbone suspension system, which offers a good balance between ride comfort and control. Key components include:

• Shocks (or Struts): These dampen vibrations and control the movement of the suspension. They prevent the car from bouncing excessively after hitting a bump.
• Springs: These support the vehicle's weight and absorb impacts. They work in conjunction with the shocks to provide a smooth ride.
• Control Arms: These connect the suspension to the vehicle's frame and allow the wheels to move up and down. They also help maintain proper wheel alignment.
• Bushings: These are rubber or polyurethane parts that cushion the connection points between suspension components. They absorb vibrations and reduce noise.
• Sway Bar (Anti-Roll Bar): This connects the left and right sides of the suspension and helps reduce body roll during cornering.

Why is the rear suspension so important? A well-functioning rear suspension is vital for:

• Ride Comfort: It absorbs bumps and vibrations, providing a smooth and comfortable ride for you and your passengers.
• Handling and Stability: It keeps the tires in contact with the road, providing good handling and stability, especially during cornering and braking.
• Safety: A worn or damaged rear suspension can compromise handling and braking, increasing the risk of accidents.
• Tire Wear: A properly aligned suspension ensures even tire wear, extending the life of your tires.

Regular inspection and maintenance of your Subaru Forester's rear suspension are essential to ensure its proper functioning and your safety on the road. Ignoring problems can lead to more extensive and costly repairs down the line. Listen for unusual noises, pay attention to how your car handles, and don't hesitate to consult a mechanic if you suspect any issues.

Common Rear Suspension Problems in Subaru Foresters

Rear suspension problems can manifest in various ways on your Subaru Forester. Being aware of the common issues helps you identify problems early and prevent further damage. Here are some telltale signs and frequent culprits:

• Noises: Clunking, squeaking, or rattling sounds coming from the rear suspension are often indicators of worn components. Clunking noises might suggest worn bushings or loose connections, while squeaking could point to dry or damaged bushings. Rattling could indicate a loose shock absorber or other suspension part.
• Poor Handling: If your Forester feels unstable, bouncy, or difficult to control, especially when cornering or braking, it could be due to suspension issues. Excessive body roll during turns, a feeling of floating, or difficulty maintaining a straight line are all warning signs.
• Uneven Tire Wear: Irregular wear patterns on your rear tires can be a sign of misalignment or worn suspension components. Feathering (wear on one side of the tread blocks) or cupping (scalloped wear patterns) are common indicators.
• Sagging Rear End: If the rear of your Forester sits lower than usual, it could indicate worn or broken springs. This can affect handling and ride quality.
• Leaking Shocks/Struts: Visible fluid leaks on your shocks or struts indicate that they are failing and need replacement. Leaking shocks will not be able to properly dampen vibrations, leading to a bouncy ride.

Specific Components that Often Fail:

• Bushings: These are a common wear item, especially in areas with harsh climates or rough roads. Worn bushings can cause noise, play in the suspension, and poor handling.
• Shocks/Struts: These wear out over time and lose their ability to effectively dampen vibrations. This can lead to a bouncy ride, poor handling, and increased wear on other suspension components.
• Springs: While springs are generally durable, they can break or sag over time, especially if the vehicle is frequently loaded with heavy cargo.
• Sway Bar Links: These connect the sway bar to the suspension and can wear out or break, leading to excessive body roll during cornering.

External Factors: Road conditions, driving habits, and climate can all affect the lifespan of your Subaru Forester's rear suspension components. Regularly driving on rough roads, aggressive driving, and exposure to salt and extreme temperatures can accelerate wear and tear.

Addressing these rear suspension problems promptly is important for maintaining your Forester's safety, handling, and ride quality. Ignoring these issues can lead to further damage, more costly repairs, and a compromised driving experience. If you notice any of the signs mentioned above, it's best to have your vehicle inspected by a qualified mechanic.

Diagnosing Rear Suspension Issues

Diagnosing rear suspension issues on your Subaru Forester requires a systematic approach to pinpoint the root cause of the problem. It involves a combination of visual inspections, physical tests, and sometimes specialized equipment. Here's a breakdown of the diagnostic process:

1. Visual Inspection:
   • Check for Obvious Damage: Look for any visible signs of damage to the suspension components, such as broken springs, bent control arms, or leaking shocks/struts.
   • Inspect Bushings: Examine the bushings for cracks, tears, or excessive wear. Use a flashlight to get a better view.
   • Look for Leaks: Check the shocks/struts for any signs of fluid leaks. Even a small amount of leakage can indicate a failing shock.
   • Tire Wear Patterns: Observe the tire wear patterns. Uneven wear can indicate misalignment or suspension problems.
2. Physical Tests:
   • Bounce Test: Push down firmly on the rear of the vehicle and release it. Observe how the suspension reacts. The vehicle should rebound quickly and settle without excessive bouncing. Excessive bouncing indicates worn shocks/struts.
   • Listen for Noises: While performing the bounce test, listen for any unusual noises coming from the suspension. Clunking, squeaking, or rattling sounds can help identify the source of the problem.
   • Check for Play: With the vehicle safely supported on jack stands, try to move the suspension components by hand. Check for any excessive play in the bushings, ball joints, or wheel bearings.
3. Professional Inspection:
   • Alignment Check: A professional alignment check can reveal any misalignment issues that may be causing uneven tire wear or handling problems.
   • Specialized Tools: Mechanics have access to specialized tools, such as ball joint testers and bushing tools, that can help diagnose suspension problems more accurately.
   • Scan Tools: While less common for suspension issues, scan tools can sometimes reveal problems with electronic suspension components, if equipped.

Tools You Might Need:

• Jack and Jack Stands: To safely lift and support the vehicle.
• Wrenches and Sockets: For loosening and tightening bolts and nuts.
• Pry Bar: For levering suspension components.
• Flashlight: For inspecting hard-to-see areas.
• Gloves and Safety Glasses: For personal protection.

Common Diagnostic Mistakes to Avoid:

• Replacing Parts Without Proper Diagnosis: Avoid simply replacing parts without properly diagnosing the problem. This can be costly and may not fix the issue.
• Ignoring Seemingly Minor Issues: Even small problems, such as worn bushings, can lead to more significant damage if left unaddressed.
• Not Considering External Factors: Remember to consider external factors, such as road conditions and driving habits, when diagnosing suspension problems.

By following a thorough diagnostic process, you can accurately identify the cause of your Subaru Forester's rear suspension issues and take the necessary steps to repair them. If you're not comfortable performing the diagnosis yourself, it's always best to consult a qualified mechanic.

Repairing Your Subaru Forester Rear Suspension

Repairing your Subaru Forester's rear suspension involves replacing worn or damaged components to restore its proper function. The specific repair procedure will vary depending on the issue and the component being replaced, but here's a general overview of the process:

1. Preparation:
   • Gather Tools and Parts: Make sure you have all the necessary tools and replacement parts before starting the repair. Refer to your vehicle's service manual or a trusted online resource for a list of required tools and parts.
   • Safety First: Always prioritize safety when working on your vehicle. Wear safety glasses and gloves, and use jack stands to support the vehicle securely.
   • Loosen Lug Nuts: Before lifting the vehicle, loosen the lug nuts on the rear wheels.
2. Removal:
   • Lift and Secure the Vehicle: Use a jack to lift the rear of the vehicle and place jack stands under the frame for support. Remove the rear wheels.
   • Disconnect Components: Disconnect any components that are attached to the part you're replacing, such as brake lines, ABS sensors, and sway bar links. Be careful not to damage these components.
   • Remove the Old Part: Use the appropriate tools to remove the old suspension component. This may involve loosening bolts, disconnecting ball joints, or using a spring compressor (for replacing springs or shocks/struts).
3. Installation:
   • Install the New Part: Install the new suspension component in the reverse order of removal. Make sure all bolts are tightened to the correct torque specifications.
   • Reconnect Components: Reconnect any components that you disconnected earlier, such as brake lines, ABS sensors, and sway bar links.
   • Reinstall Wheels: Reinstall the rear wheels and tighten the lug nuts to the correct torque specifications.
4. Finishing Up:
   • Lower the Vehicle: Lower the vehicle back to the ground.
   • Test Drive: Take the vehicle for a test drive to ensure that the repair was successful and that the suspension is functioning properly.
   • Alignment: It's always a good idea to get a wheel alignment after performing any suspension work. This will ensure that your tires wear evenly and that your vehicle handles properly.

Specific Repair Examples:

• Replacing Shocks/Struts: This involves compressing the spring (using a spring compressor), removing the old shock/strut, and installing the new one. It's important to use caution when working with springs, as they can be dangerous if not handled properly.
• Replacing Bushings: This may require special bushing tools to press the old bushings out and the new ones in. In some cases, you may need to replace the entire control arm if the bushings are not replaceable.
• Replacing Springs: This also requires a spring compressor to safely remove and install the springs.

Tips for a Smooth Repair:

• Refer to a Service Manual: A service manual provides detailed instructions and torque specifications for your specific vehicle.
• Take Pictures: Take pictures of the suspension before you start the repair. This can be helpful if you get stuck or forget how something goes back together.
• Use Quality Parts: Use high-quality replacement parts from a reputable brand. This will ensure that the repair lasts and that your vehicle handles properly.
• Don't Force Anything: If something doesn't seem to fit, don't force it. Double-check that you have the correct part and that you're installing it correctly.

Upgrading Your Subaru Forester Rear Suspension

Upgrading your Subaru Forester's rear suspension can improve its handling, ride quality, and overall performance. Whether you're looking for a sportier feel, better off-road capability, or simply a more comfortable ride, there are several upgrade options to consider.

Common Upgrade Options:

• Performance Shocks/Struts: Upgrading to performance shocks or struts can improve handling and reduce body roll. Look for brands like Bilstein, KYB, or Koni. These shocks often offer better damping characteristics, providing a more controlled and responsive ride.
• Stiffer Springs: Installing stiffer springs can also improve handling and reduce body roll. However, it can also make the ride harsher. Consider brands like Eibach or Swift Springs. These are good if you carry heavy loads or tow frequently.
• Sway Bar Upgrade: Upgrading to a larger or adjustable sway bar can further reduce body roll and improve handling. Whiteline and Cusco are popular brands.
• Lift Kits: If you're looking to improve off-road capability, a lift kit can provide additional ground clearance and allow you to install larger tires. Popular brands include ReadyLIFT and Anderson Design Fabrication.
• Air Suspension: Air suspension systems offer adjustable ride height and damping, providing a comfortable ride on the street and improved off-road capability. AccuAir and Air Lift Performance are well-known brands.

Benefits of Upgrading:

• Improved Handling: Upgraded suspension components can improve handling and reduce body roll, making your Forester more fun to drive.
• Enhanced Ride Quality: Depending on the upgrade, you can improve ride quality, making your Forester more comfortable on long trips.
• Increased Off-Road Capability: Lift kits and air suspension systems can increase ground clearance and allow you to tackle more challenging terrain.
• Sportier Look: Upgraded suspension components can give your Forester a sportier and more aggressive look.

Things to Consider Before Upgrading:

• Budget: Suspension upgrades can range in price from a few hundred dollars to several thousand dollars. Set a budget before you start shopping.
• Driving Style: Consider your driving style and what you want to achieve with the upgrade. Are you looking for better handling, a more comfortable ride, or improved off-road capability?
• Installation: Some suspension upgrades are relatively easy to install, while others require professional installation. Factor in the cost of installation when budgeting for the upgrade.
• Compatibility: Make sure that the suspension components you choose are compatible with your Subaru Forester. Check the manufacturer's website or consult a qualified mechanic.

Potential Drawbacks:

• Increased Harshness: Stiffer springs and performance shocks can make the ride harsher.
• Reduced Fuel Economy: Lift kits and larger tires can reduce fuel economy.
• Increased Wear and Tear: Upgraded suspension components may put more stress on other parts of the vehicle, leading to increased wear and tear.

By carefully considering your needs and budget, you can choose the right rear suspension upgrades for your Subaru Forester and enjoy improved handling, ride quality, and overall performance.

Maintaining Your Subaru Forester Rear Suspension

Maintaining your Subaru Forester's rear suspension is crucial for ensuring its longevity, performance, and safety. Regular maintenance can help prevent problems, extend the life of suspension components, and save you money on costly repairs in the long run. Here are some essential maintenance tips:

• Regular Inspections: Inspect your rear suspension regularly for any signs of damage, wear, or leaks. Check the shocks/struts, springs, bushings, and control arms. Look for cracks, tears, or excessive play.
• Keep it Clean: Wash the undercarriage of your Forester regularly, especially after driving on salted roads or in muddy conditions. This will help prevent corrosion and protect the suspension components.
• Lubricate Components: Lubricate the suspension components regularly, especially the bushings and ball joints. Use a high-quality silicone-based lubricant. This will help reduce friction and prevent wear.
• Check Alignment: Have your wheel alignment checked regularly, especially after hitting a large pothole or curb. Misalignment can cause uneven tire wear and handling problems.
• Replace Worn Parts: Replace worn suspension components promptly. Don't wait until they fail completely. Worn bushings, shocks, and springs can affect handling and ride quality.
• Avoid Overloading: Avoid overloading your Forester, as this can put excessive stress on the suspension components. Check the vehicle's owner's manual for weight limits.
• Drive Carefully: Drive carefully and avoid hitting potholes or other obstacles. This will help protect the suspension components from damage.

Key Maintenance Tasks and Schedule:

• Every 6 Months/6,000 Miles:
  • Inspect suspension components for damage or wear.
  • Check tire pressure and wear patterns.
• Every 12 Months/12,000 Miles:
  • Lubricate suspension components.
  • Check wheel alignment.
• Every 30,000 Miles:
  • Replace shocks/struts (if needed).
  • Replace bushings (if needed).

Products to Use:

• Silicone-Based Lubricant: For lubricating suspension components.
• Rust Inhibitor: For protecting suspension components from corrosion.
• Car Wash Soap: For cleaning the undercarriage of your Forester.

Why Maintenance Matters:

• Improved Safety: A well-maintained suspension ensures safe handling and braking.
• Extended Component Life: Regular maintenance can extend the life of suspension components.
• Reduced Repair Costs: Preventing problems through maintenance can save you money on costly repairs.
• Enhanced Ride Quality: A properly maintained suspension provides a comfortable ride.

By following these maintenance tips, you can keep your Subaru Forester's rear suspension in top condition and enjoy a safe, comfortable, and reliable ride for years to come.

Taking care of your Subaru Forester's rear suspension is an investment in your vehicle's longevity and your safety. Stay proactive with inspections, address issues promptly, and consider upgrades to match your driving needs. A well-maintained suspension translates to a smoother, safer, and more enjoyable driving experience. Happy trails!