Back End Of Car Sways When I Hit A Bump

Back End of Car Sways When I Hit a Bump: Causes and Solutions

Experiencing a swaying sensation in the back end of your car when hitting a bump can be unsettling and indicate underlying issues with your vehicle’s suspension or other components. This article delves into the potential causes of this problem and provides guidance on how to address them.

Causes of Back End Swaying

  • Worn or Damaged Shock Absorbers

Shock absorbers play a crucial role in damping the oscillations of the suspension system, preventing excessive bouncing and swaying. Worn or damaged shock absorbers can no longer effectively control the movement of the suspension, resulting in a swaying sensation.

  • Weak or Broken Springs

Springs support the weight of the vehicle and help absorb road irregularities. Weak or broken springs can cause the car to sag and lose its ability to handle bumps properly, leading to swaying.

  • Loose or Worn Suspension Components

Various suspension components, such as control arms, ball joints, and tie rods, can become loose or worn over time. This can cause the suspension to become misaligned and affect the vehicle’s handling, resulting in swaying.

  • Improper Tire Inflation

Underinflated or overinflated tires can alter the vehicle’s handling characteristics and contribute to swaying. Maintaining proper tire pressure is essential for optimal suspension performance.

  • Misaligned Wheels

Improper wheel alignment can cause uneven tire wear and affect the suspension’s ability to absorb bumps effectively. This can lead to a swaying sensation in the back end of the car.

Types of Swaying

  • Lateral Sway

Lateral swaying occurs when the car moves side-to-side when hitting a bump. This is typically caused by worn shock absorbers, weak springs, or loose suspension components.

  • Vertical Sway

Vertical swaying involves the car bouncing excessively up and down when hitting a bump. This is usually caused by worn or damaged shock absorbers or weak springs.

Differences Between Swaying and Bouncing

Swaying refers to the side-to-side movement of the car, while bouncing refers to the up-and-down movement. Swaying is typically caused by suspension issues, while bouncing can be caused by both suspension and tire problems.

Ease of Repair

The ease of repairing the back end swaying issue depends on the underlying cause. Replacing shock absorbers or springs requires some mechanical knowledge and tools. Loose suspension components can be tightened or replaced with relative ease. However, improper wheel alignment or tire inflation issues can be easily addressed by a mechanic or tire shop.

Process of Repair

  1. Diagnose the Cause: Identify the specific cause of the swaying by inspecting the suspension components, checking tire pressure, and performing a wheel alignment check.
  2. Replace Worn Components: If shock absorbers, springs, or suspension components are worn or damaged, they need to be replaced with new ones.
  3. Tighten Loose Components: Loose suspension components can be tightened using appropriate tools.
  4. Adjust Tire Pressure: Ensure that tires are inflated to the manufacturer’s recommended pressure.
  5. Align Wheels: If necessary, have the wheels aligned by a mechanic to correct any misalignment.

Advantages of Repairing Back End Swaying

  • Improved Handling and Stability

Repairing the swaying issue enhances the vehicle’s handling and stability, making it safer and more enjoyable to drive.

  • Reduced Tire Wear

Proper suspension function helps prevent uneven tire wear, extending tire life.

  • Increased Comfort

A well-functioning suspension system absorbs bumps effectively, providing a more comfortable ride.

Disadvantages of Ignoring Back End Swaying

  • Safety Concerns

Ignoring swaying can compromise the vehicle’s handling and stability, increasing the risk of accidents.

  • Accelerated Tire Wear

Uncontrolled swaying can cause uneven tire wear, leading to premature tire replacement.

  • Discomfort

A swaying car can make driving uncomfortable and tiring.

How to Prevent Back End Swaying

  • Regular Maintenance

Regularly inspect and maintain the suspension system, including shock absorbers, springs, and other components.

  • Proper Tire Inflation

Maintain proper tire pressure as recommended by the manufacturer.

  • Avoid Overloading

Avoid overloading the vehicle, as this can put excessive strain on the suspension.

  • Slow Down on Bumps

Slowing down before hitting bumps can reduce the impact on the suspension.

  • Professional Inspection

If you notice any signs of swaying, have your vehicle inspected by a mechanic to identify and address the underlying cause.

What to Look for When Inspecting Suspension Components

  • Shock Absorbers

Check for leaks or damage on the shock absorber body. Test the shock absorber by pushing down on the car and releasing it. It should rebound smoothly without excessive bouncing.

  • Springs

Inspect the springs for cracks, rust, or sagging. The springs should be evenly spaced and not compressed excessively.

  • Suspension Components

Look for loose or worn ball joints, control arms, and tie rods. Check for any play or movement in these components.


Experiencing a swaying sensation in the back end of your car when hitting a bump can be caused by various issues with the suspension or other components. By understanding the potential causes, types, and differences between swaying and bouncing, you can better assess the problem and take appropriate action. Repairing the underlying issue is crucial for improved handling, stability, tire wear, and overall comfort. Regular maintenance and preventive measures can help prevent back end swaying and ensure a safe and enjoyable driving experience.


  • Can I fix back end swaying myself?

It depends on the underlying cause. Simple issues like loose suspension components or improper tire inflation can be addressed by DIY enthusiasts. However, replacing shock absorbers or springs requires mechanical knowledge and tools.

  • How much does it cost to repair back end swaying?

The cost of repair varies depending on the cause. Replacing shock absorbers or springs can range from $200 to $600 per axle, while tightening loose components or adjusting tire pressure is relatively inexpensive.

  • Can back end swaying cause other problems?

Yes, ignoring back end swaying can lead to accelerated tire wear, reduced handling and stability, and discomfort while driving.

  • How often should I inspect my suspension system?

It is recommended to inspect the suspension system at least once a year or more frequently if you drive in rough road conditions.

  • What are the signs of worn shock absorbers?

Signs of worn shock absorbers include excessive bouncing, swaying, or instability when driving, as well as oil leaks or damage on the shock absorber body.

Closing Statement

Back end swaying when hitting a bump is a common issue that can be caused by various factors. By understanding the potential causes and taking appropriate action, you can ensure a safe and comfortable driving experience. Regular maintenance and preventive measures are key to preventing back end swaying and maintaining optimal vehicle performance.


The information provided in this article is intended for general knowledge and guidance purposes only. It is not intended to replace professional advice or diagnosis from a qualified mechanic. Always consult with a certified mechanic for specific vehicle repair and maintenance needs.