How do I know if my new struts are bad?

If you've recently replaced the struts on your vehicle, it's important to know how to identify if the new struts are functioning properly. Faulty struts can lead to a range of issues, from poor handling to accelerated tire wear. In this article, we'll provide a detailed guide on how to determine if your new struts are bad.

Signs of Bad Struts

There are several telltale signs that your new struts may be malfunctioning. These include:

• Excessive bouncing or "bottoming out" when driving over bumps or uneven surfaces


• Noticeable swaying or "drifting" when making turns


• Uneven tire wear, particularly on the outer edges of the tires


• Difficulty maintaining control of the vehicle, especially at higher speeds


• Leaking fluid from the strut assembly

If you notice any of these issues, it's important to have your vehicle inspected by a qualified mechanic as soon as possible.

Performing a Visual Inspection

One of the easiest ways to check the condition of your new struts is to perform a visual inspection. Here's what to look for:

• Check for any visible signs of damage or wear, such as cracks, dents, or leaks


• Examine the strut boots (the rubber covers that protect the strut assembly) for any tears or deterioration


• Look for any signs of fluid leakage, which can indicate a problem with the strut seals


• Ensure that the strut assembly is securely mounted and not loose

If you notice any issues during your visual inspection, it's best to have the struts replaced by a professional.

Performing a Bounce Test

Another way to check the condition of your new struts is to perform a bounce test. Here's how to do it:

1. Park your vehicle on a level surface and apply the parking brake.


2. Firmly push down on the front of the vehicle, then release it. Observe how many times the vehicle bounces before coming to a stop.


3. Repeat the process on the rear of the vehicle.

If the vehicle bounces more than 2-3 times, it may indicate that the new struts are not functioning properly and need to be replaced.

Remember, it's always best to have your vehicle inspected by a qualified mechanic if you have any concerns about the condition of your new struts. Proper maintenance and timely replacement of worn components can help ensure the safety and longevity of your vehicle.

What sound does a bad strut make?

A bad strut can make a variety of sounds, including a clunking, banging, or knocking noise, especially when going over bumps. You may also hear a squeaking or creaking sound, particularly when turning, or a metallic grinding noise from the strut assembly. 
Types of sounds and what they mean

• Clunking, banging, or knocking: This is often caused by the strut bottoming out or by loose components in the strut assembly. It is most noticeable when driving over bumps. 
• Squeaking or creaking: This typically indicates that the strut bushings are struggling to provide their damping function. You may hear this more at lower speeds or when hitting larger bumps. 
• Metallic grinding or squeaking: This noise can occur when turning and may point to a bad strut mount bearing or other worn components. 
• Rattling: This can also be a symptom of a failing strut, especially when driving over rough roads. 

Other signs of a bad strut
Besides the sounds, other symptoms of bad struts include: 

• A rough or bouncy ride, even on smooth roads
• Uneven tire wear
• Reduced handling and braking performance
• Visible signs of hydraulic oil leakage from the strut

Is it normal to ride still rough harsh and bouncy after strut shocks are replaced?

A rough and bouncy ride after replacing shocks and struts can be caused by improper installation, such as incorrect torque or top mount alignment, or by other worn suspension components that were not replaced. It's also possible that a break-in period is still needed for the new parts, or that the new struts are simply stiffer than the old, worn-out ones were. Finally, incorrect tire pressure or a need for a wheel alignment can also be the culprit.
 
Possible causes and solutions
This video demonstrates how to check for potential issues after installing new struts: 56sThe Browne TownYouTube · Apr 20, 2022
Installation issues

• Improper alignment: The top strut mount might be misaligned, which can cause noise and a rough ride, explains this YouTube video. 
• Incorrect torque: Bolts and nuts were not tightened to the manufacturer's specifications, which can lead to excessive movement. 
• Overlooked components: The technician may have missed replacing other worn parts, such as the strut mounts, sway bar links, or bushings. 

Other suspension problems

• Incorrect parts: The new struts may not be the correct model for your vehicle, leading to a poor ride quality. 
• Worn parts: Other suspension components, like ball joints or control arms, might be worn and contributing to the poor ride. 
• Unreplaced parts: If only the front struts were replaced, the rear struts could be the cause of the imbalance, especially if the original rear ones were very worn. 

Other potential causes

• Tire pressure: Low tire pressure can mask the original poor ride, making the new struts feel harsher. Check your tires' pressure to ensure it's correct. 
• Break-in period: New struts can feel stiffer initially as they settle in. A short break-in period may be necessary before the ride quality improves. 
• Stiff new struts: If your old struts were extremely worn, the new ones may feel "rough" by comparison, even though they are working correctly. The damping rate of new struts is higher, which means they absorb energy faster. 

What to do next

• Double-check installation: Have another mechanic inspect the installation to ensure all components were properly torqued and aligned. 
• Consider replacement of other parts: If the initial replacement was only for the front, consider replacing the rear struts and other worn suspension components. 
• Perform a wheel alignment: A proper wheel alignment is crucial after a strut replacement and can help resolve handling issues. 
• Get a second opinion: If you are still experiencing issues after checking the above, it is best to get a second opinion from a different mechanic. 

How to tell if a new strut is bad?

Signs of Bad Shocks & Struts

1. Nose dive when braking.
2. Bouncy ride.
3. Vehicle rolls or sways when cornering.
4. Uneven tire wear.
5. Rear squat during acceleration.
6. Vibration in steering wheel.
7. Unusual noises.
8. Leaking fluid on exterior of shocks/struts.

How to test your struts?

You can check struts by performing the "bounce test" (pushing down on the car and seeing how many times it bounces) or by a visual inspection for oil leaks and damage. Observing how the vehicle handles, noting any unusual noises, and checking for uneven tire wear are also indicators of worn struts.
 
Bounce test

1. Park your car on a flat surface and engage the parking brake. 
2. Push down firmly on one corner of the vehicle (e.g., the front bumper) a few times, then let go. 
3. If the vehicle comes to an immediate stop after one rebound, the struts are likely fine. 
4. If the vehicle continues to bounce or rocks back and forth more than once, the struts may be worn out. 
5. Repeat this test on all four corners of the vehicle. 

Visual inspection

• Look for leaks: Check the body of the strut for any signs of oil leakage, which may look like a stain or oily residue. Leaks indicate a broken seal. 
• Check for damage: Inspect the struts for any physical damage, such as dents. 
• Examine the boot: Look for any tears or cracks in the rubber boot around the strut. 

You can watch this video to learn how to check for signs of worn out struts: 1m1A Auto: Repair Tips & Secrets Only Mechanics KnowYouTube · Feb 23, 2018
Observe driving and handling

• Note any unusual noises: Listen for clunking or rattling sounds, especially when going over bumps or taking turns. 
• Watch for handling issues: Pay attention to how your car handles during braking and cornering. Signs of bad struts include excessive body roll, a "diving" sensation during braking, or a "squatting" effect in the rear during acceleration. 
• Feel for steering issues: A wobbly or shaky steering wheel after hitting a bump can be a symptom of worn struts. 
• Check tire wear: Look for uneven tire wear, particularly on the edges, as this can be a sign of bad struts.