How to Compress a Shock Absorber of a Car: 9 Steps

Shock absorbers are critical components of your vehicle’s suspension system. They help maintain tire contact with the road, providing a smooth ride and effective steering. Over time, they may require maintenance or replacement, which involves a process called shock compression. This article will guide you step-by-step process regarding how to compress a shock of the vehicle.

compress shock spring

What You Will Need

Before starting, make sure you have the following tools at your disposal:

  • A pair of safety gloves
  • Safety glasses
  • A spring compressor tool
  • A set of wrenches
  • A jack and jack stands

Remember that safety is paramount, so ensure you are well-protected before starting.

How to Compress a Shock (Steps)

Step 1: Loosening the Lug Nuts

First, you’ll need to loosen the lug nuts on the wheels. It should be done while the car is still on the ground. Use a wrench to turn the lug nuts counterclockwise. Do not remove the lug nuts at this point; only loosen them.

Step 2: Raising the Car

Once the lug nuts are loose, you can raise the car using a jack. Be sure to jack the car up in the proper location, as indicated by your car’s manual. Once the car is high enough, place jack stands under it to ensure it is securely supported.

Step 3: Removing the Wheel

With the car securely supported on jack stands, you can remove the lug nuts completely. Once removed, take off the wheel. This will give you access to the shock absorber.

Step 4: Locating the Shock Absorber

The shock absorber is located in the wheel well. Depending on your car model, it may be covered by a plastic cover, which you must remove.

Step 5: Detaching the Shock Absorber

Once you’ve located the shock absorber, use a wrench to detach it from the car’s frame. There will be bolts at the top and bottom of the shock. Be careful when removing the last bolt, as the shock will become free and could fall.

Step 6: Compressing the Spring

Now, you’ll need your spring compressor tool. Attach it to the spring on the shock according to the manufacturer’s instructions. Once attached, tighten the tool to compress the spring. Ensure the spring is compressed enough so the shock absorber piston rod can move freely.

Step 7: Removing the Spring

With the compressed spring, you can remove the retaining nut at the top of the shock. This will free the spring from the shock absorber.

Step 8: Decompressing the Spring

After removing the spring, you can decompress it using the spring compressor tool. It should be done slowly and carefully to avoid injury.

Step 9: Reinstalling the Shock

Now, you can reinstall the shock absorber. Reverse the removal process: place the shock back into position, secure the bolts, reinstall the wheel, and lower the car. Remember to tighten the lug nuts once the car is back on the ground.

Compressing Car Shock YouTube

Tips and Warnings

It’s crucial always to follow safety guidelines when working on your car. Shock absorbers are under high tension, so handling them carefully is important to avoid accidents. Never try to compress a spring without a proper spring compressor tool.

Reasons for compressing a shock absorber of a vehicle

You might need to compress a shock absorber on a vehicle for several reasons. Here are some of the most common ones:


Over time, shock absorbers wear out and need to be replaced. Compressing the shock absorber is a crucial step in the replacement process as it allows for removing the old unit and installing the new one.

Maintenance and Repair:

If a shock is leaking oil or gas, making noise, or not functioning properly, you may need to compress it to fix leaking shock absorber.

Vehicle Modification:

If you’re modifying your vehicle’s suspension for better performance, off-road use, or a lower ride height, you may need to compress the shock absorbers to fit new, different-sized components.


If you suspect your vehicle’s shocks are not performing as they should, compressing them is often part of the process to inspect and diagnose potential issues. By removing and inspecting the shock absorber, you can determine if it’s functioning correctly or if there are signs of wear and tear that require attention.

Spring Replacement:

If the springs attached to the shock absorbers need to be replaced, the shock absorber must be compressed to safely remove the spring.

Compressing a shock absorber involves significant force and should be done carefully using the right tools to ensure safety. It’s always best to consult a professional mechanic if you’re unsure.

Why my shock absorber is hard to compress?

If your shock absorber is hard to compress, there can be several reasons:

Worn-Out Shocks:

Over time, shock absorbers can wear out due to regular use, bad road conditions, or general wear and tear. This can cause the shocks to seize or become more challenging to compress.

Incorrect Tool Use:

You may find it very difficult if you’re trying to manually compress a shock without using a shock compression tool or not using it correctly. The right tools are necessary to safely and effectively compress a shock absorber.

Gas Charged Shocks:

Some shock absorbers are gas-charged, making them harder to compress than traditional oil-filled shocks. The extra resistance you’re feeling could be due to the gas charge in the shock absorber.

Faulty Shocks:

If the shock absorber is faulty, it can be hard to compress. Faults can include internal parts breaking or the fluid inside becoming contaminated.

Temperature Factors:

Shocks can become harder to compress in cold weather due to thickening the fluid inside. Conversely, in hot weather, the fluid can thin out, but this typically makes the shock easier to compress rather than harder.

If your shock absorber is proving difficult to compress and you can’t identify the reason, it might be worth consulting a professional mechanic. They can help determine if the shock is faulty or worn out and needs replacing or if there’s another issue at play. Always remember that working with shock absorbers can be dangerous due to the high tension, so proceed cautiously and use the appropriate safety measures.

How much should a shock absorber be compressed?

A shock absorber should be compressed enough to safely remove the coil spring. The exact amount varies depending on the type and size of the shock and the spring. Generally, the goal is to compress the spring until it’s loose on the shock absorber, which typically involves compressing it by a few inches. It’s essential to remember that over-compression can damage the shock or spring and pose a significant safety risk.

Always follow the manufacturer’s guidelines and ensure you’re using a proper spring compressor tool to perform this task safely and correctly. Shock absorbers, especially new ones, are generally too strong to be compressed by hand. They are designed to absorb large forces produced by the motion of a vehicle and therefore require significant force to compress.

Should I be able to compress a shock by hand?

While you might be able to compress worn-out or faulty shocks by hand slightly, this is usually not the case with healthy ones. Furthermore, attempting to do so can be dangerous, as shocks and springs are under high tension and can cause harm if they recoil unexpectedly.

Proper tools, like a spring compressor, are needed to compress a shock absorber safely. It should be done with care and per manufacturer guidelines. If you’re unsure about any aspect of this process, it’s best to seek professional help to avoid potential harm or damage to your vehicle.


Compressing a shock absorber can be challenging, but with the right tools and safety measures, you can do it at home. Always consult your vehicle’s manual and follow the manufacturer’s instructions closely. If in doubt, seek professional assistance.


Mr. Shafiqule Islam is a graduated Mechanical Engineer and has more than 15 years experience of repairing and maintenance of different brand vehicles like Toyota, Mitsubishi, Ford, Mercedes, BMW etc. He is also giving training to Mechanics. He has started writing to share his practical knowledge to Vehicle Owners, Drivers and Mechanics to keep their cars at best fit.

Recent Posts