A clunk when crossing a bump or a more shaky ride can be unsettling, and chances are, you’re wondering what the issue is and whether it’s a cause for worry. Such signs are common in faulty suspensions, but can also be triggered by other systems and parts. As such, it’s important to have a stable starting point before wildly guessing at parts.
This guide will take you through the most common suspension failure symptoms as well as a few simple checks you can perform yourself. You’ll come out the other end being able to determine better if the suspension is at fault, and possibly, narrowing down the exact cause and location of the suspension issue.
Quick Reference: Suspension Symptoms at a Glance
| Symptom | Likely Cause |
| Clunking or knocking over bumps | Worn control arm bushings or ball joints |
| Bouncy, unsettled ride | Failing shocks or struts |
| Car pulls to one side | Uneven spring wear or a worn component on one side |
| Nose-diving under braking | Struts losing their damping control |
What Counts as Suspension on Your Car
Your car’s suspension is the group of components that connects the wheels to the vehicle body while allowing the wheels to move over uneven surfaces. It helps maintain tire contact with the road, supports the vehicle’s weight, and contributes to ride comfort and handling.
While there are a number of parts that work together with the suspension, they are not all considered to be part of it. The following are the parts that comprise the suspension:
- Springs which support the vehicle and absorb larger impacts,
- Shocks or struts, which control spring movement and prevent excessive bouncing,
- Control arms that locate the wheels and allow controlled movement,
- Bushings which cushion the connections between suspension components and the body or subframe,
- Ball joints that provide a pivot point between control arms and steering or wheel assemblies, and
- Sway bar links which connect the stabilizer bar to the suspension and help limit body roll during cornering.
The Most Common Bad Suspension Symptoms
Recognizing the most common symptoms can help alert you that your suspension needs repair, and can also narrow down which suspension parts need inspection. These are:
1) Clunking or Knocking Over Bumps
A clunking or knocking sound when driving over bumps can indicate wear or looseness in suspension components.
2) Bouncy or Unsettled Ride
If your car continues to bounce after passing over a bump, the shocks or struts may no longer be controlling spring movement effectively. Excessive bouncing can not only make the vehicle feel unsettled, it may make driving unsafe by reducing tire contact with the road, particularly over uneven surfaces.
3) Car Pulls to One Side
A vehicle that pulls left or right can have a suspension or alignment problem. Worn or damaged suspension components can alter wheel geometry, while a damaged spring or uneven suspension height can contribute to uneven tracking. These symptoms are also shared with tire pressure and steering component issues, so those should also be checked before blaming the suspension.
4) Uneven Tire Wear
Worn out suspension parts can affect how the tires sit against the road, causing uneven or irregular tread wear. Worn bushings, ball joints, control arms, or other components can allow unwanted wheel movement and affect alignment.
5) Nose-Diving Under Braking
If the front of the vehicle drops noticeably under braking, worn shocks or struts may be contributing to poor suspension control. Excessive nose-dive can make braking feel less controlled and may indicate that the suspension is no longer properly managing vehicle movement.
5) Excessive Body Roll in Turns
A car that leans heavily through corners may worn shocks or struts, or problems involving the sway bar and its links. Excessive body roll can make the vehicle feel less stable and predictable during cornering, particularly when changing direction quickly.
Suspension Noise: What Different Sounds Mean
The type of noise your suspension makes can provide a useful clue about where the problem may be even before you send your car into the shop.
A clunk or knocking sound when driving over bumps commonly points to movement or play in components such as control-arm bushings, ball joints, or sway bar links. A squeak or creak may indicate a dry or deteriorated bushing, particularly when the suspension moves slowly over uneven ground or when entering a driveway. A grinding or grating sound can point toward a worn strut bearing or mount, especially when turning the steering wheel while the vehicle is stationary or moving slowly.
Quick Checks You Can Do Yourself
You can perform a few simple suspension checks at home without tools. The first is the bounce test. Push down firmly on one corner of the vehicle and release it. The car should settle quickly rather than continuing to bounce repeatedly. Compare the same corner on the opposite side for noticeable differences.
Next, look behind each wheel for signs of leaking shocks or struts. Oil or fluid coating the outside of the damper can indicate a failed seal, although a dirty or damp-looking component does not always mean replacement is necessary.
Finally, inspect the tire tread for uneven cupping. Run your hand lightly across the tread and look for alternating high and low spots around the tire. This type of irregular wear is commonly associated with worn shocks or struts, although other issues like tire imbalance, alignment problems, can produce similar patterns.
When to Get It Inspected
If your vehicle is exhibiting multiple symptoms on our list, such as suspension noise, excessive bouncing, uneven tire wear, or increased body roll it’s worth having the vehicle inspected rather than waiting for the problem to worsen. A professional can check for play, damaged components, leaks, and alignment issues that may not be obvious during a visual inspection. They can also advise you if it’s safe to continue driving, or recommend and perform any necessary repairs or replacements.
Before booking an inspection, it can also help to understand the potential repair bill. See “Suspension Replacement Cost: What to Expect for Parts and Labor” for an overview of parts and labor costs, so you can budget for the inspection and any replacement work that may follow.
Frequently Asked Questions
Can I still drive with a bad suspension?
You may be able to drive with minor suspension wear, but significant problems can affect handling and braking. If the vehicle feels unstable, pulls sharply, or makes severe noises, have it inspected promptly.
What does a failing suspension sound like?
Common sounds include clunks, knocks, squeaks, creaks, and grinding noises. The sound and when it occurs can help identify the likely component, but inspection is needed to confirm the cause.
How do I know if it is my suspension or something else?
Look for several symptoms in this guide occurring together, such as unusual noises, excessive bouncing, uneven tire wear, or increased body roll. An inspection by a professional can provide a definitive answer if the suspension is at fault, or something else is to blame.
Is suspension noise always serious?
No. A squeak may be caused by a dry bushing, while a clunk can indicate more significant wear or looseness. However, if any noise is persistent and/or gets worse, it’s worth getting the suspension checked.