How to Bleed a Floor Jack? 8 Simple Steps to Perfect Bleeding

Floor jacks are essential tools in any garage, providing the lifting power needed to work safely beneath vehicles. However, what many people don’t realize is that these handy devices require regular maintenance to ensure they function effectively and safely. One critical aspect of floor jack maintenance is bleeding the system to remove air, a process that can significantly impact the jack’s performance and safety. 

In this comprehensive guide, we will take you through the steps of bleeding your floor jack correctly, helping you keep your workspace secure and your jack in top condition.

What is a Floor Jack Bleeding

Bleeding involves removing any trapped air from the hydraulic system of the jack, which can lead to reduced lifting capacity and potential safety hazards.

How to Bleed a Floor Jack in 8 Easy Steps

Bleeding your floor jack is the solution to this potential danger, as it ensures your hydraulic system remains air-free and your jack performs flawlessly.

Step 1: Identify the Bleed Valve

Begin by locating the versatile bleed valve on your floor jack. This single screw serves as both the entry point for jack oil and the release valve for excess air. Depending on your floor jack model, you may need to remove certain accessories to access this valve.

Step 2: Spot the Safety Valves

Once you’ve gained access to the bleed valve, take note of the safety valves. It’s crucial not to tamper with these safety features.

Step 3: Check the Oil Level

To assess the oil level, employ a Phillips head screwdriver compatible with your jack model. Remove the valve screw, and upon doing so, inspect the oil level.

Ideally, the oil should be at the same level as the top of the jack piston. If it falls below this mark, use your preferred jack oil to bring it up to the correct level.

Step 4: Reinstall and Tighten the Valve

With the appropriate oil level, replace the bleed/fill valve and securely tighten it. Ensure the jack is in its upright position, then begin pumping the jack handle to raise it to its maximum height.

Step 5: Release Excess Air

When the jack reaches its maximum height, partially open the bleed valve to allow excess air to escape from the jack piston chamber.

Release the jack, allowing it to lower fully on its own. If needed, gently apply hand pressure to expedite the descent.

Step 6: Repeat the Bleeding Process

After the jack has completely lowered, re tighten the bleed valve. Once again, lift the jack to its maximum height, as previously done in step #4.

At the pinnacle, release the bleed valve to release air, and lower the jack as instructed in step #5.

Step 7: Recheck Fluid Level

Now, with the jack at its lowest position and having bled the oil chamber twice, reexamine the fluid level.

Use a #3 screwdriver suitable for your jack model to remove the bleed valve. Confirm that the fluid level is even with the top of the jack piston.

Step 8: Finalize and Reassemble

Once you’ve confirmed the correct fluid level, replace the bleed valve screw and securely tighten it.

Finally, reassemble any floor jack accessories you removed to access the bleed fill valve screw.

Why It is Important to Bleed a Floor Jack

Bleeding a floor jack is important for several reasons, primarily related to the safety, performance, and longevity of the jack:

1. Safety

Ensuring that your floor jack is free from air bubbles in the hydraulic system is crucial for safe operation.

Air in the hydraulic system can lead to sudden and uncontrolled drops, which can pose a significant safety hazard, especially when lifting heavy objects or vehicles.

2. Consistent Performance

Bleeding a floor jack removes air from the hydraulic fluid, allowing it to flow smoothly and consistently through the system.

This results in predictable and controlled lifting and lowering actions. Inconsistent performance can make tasks more difficult and time-consuming.

3. Lifting Capacity

When air is present in the hydraulic system, it reduces the overall lifting capacity of the floor jack.

Bleeding the jack helps restore its full lifting capacity, ensuring it can handle heavy loads effectively.

4. Preventive Maintenance

Regularly bleeding your floor jack is a form of preventive maintenance. By doing so, you can identify and address issues early, preventing more significant problems from developing over time.

This can extend the life of your jack and save you money on repairs or replacements.

5. Efficiency

A properly bled floor jack operates more efficiently. It can save you time and effort when lifting vehicles or objects, making your work more productive.

5 Main Reasons to Bleed a Floor Jack

Here are some reasons why you might need to bleed a floor jack:

1. Loss of Hydraulic Pressure

Over time, air can infiltrate the hydraulic system of a floor jack, leading to a gradual loss of hydraulic pressure.

This loss of pressure can significantly impact the jack’s lifting capacity, making it less effective at lifting heavy loads.

2. Slow or Inconsistent Lifting

The presence of air in the hydraulic system can result in slow and inconsistent lifting actions. When you operate a floor jack with air bubbles in the hydraulic fluid, it may cause the lifting process to be jerky or irregular.

3. Safety Concerns

Air bubbles in the hydraulic system pose a significant safety concern when using a floor jack.

They can lead to sudden drops or instability during lifting operations. These unexpected movements can endanger your safety and damage the load being lifted.

4. Preventive Maintenance

Regular maintenance is essential to keep your floor jack operating at its best. Bleeding the floor jack is considered a preventive maintenance practice.

5. Fluid Changes and Repairs

Whenever you introduce new hydraulic fluid or perform repairs on a floor jack’s hydraulic components, bleeding becomes a necessary step.

This process ensures that the hydraulic system is free of air, guaranteeing the proper functioning of the jack.

Preventing Floor Jack Bleeding: Tips for Maintenance and Care

Here are the preventive measures to avoid floor jack bleeding, presented in headings and paragraphs:

1. Regular Maintenance

Regular maintenance is your first line of defense against floor jack bleeding. Conduct routine inspections of your floor jack, checking for signs of wear and tear, leaks, or any damaged components.

Address any issues promptly to prevent air from infiltrating the hydraulic system.

2. Use High Quality Hydraulic Fluid

Always adhere to the manufacturer’s recommendation and use the specified high-quality hydraulic fluid.

Choosing the correct type and quality of fluid is crucial for maintaining the hydraulic system’s integrity and minimizing the risk of air intrusion.

3. Check Fluid Levels

Regularly inspect the hydraulic fluid level in your floor jack and ensure it remains at the recommended level, as indicated in the owner’s manual.

Top off the fluid when necessary to maintain a properly sealed hydraulic system.

4. Proper Storage

Store your floor jack in a clean and dry environment when it’s not in use. Protect it from extreme temperatures, moisture, and contaminants that could compromise the integrity of the hydraulic system.

5. Avoid Overloading

Never exceed the recommended weight capacity of your floor jack. Overloading the jack can place undue stress on the hydraulic system, potentially causing air to enter.


Regularly bleeding your floor jack, following the steps outlined in this guide, is essential for maintaining a safe and efficient workspace. Don’t underestimate the importance of proper maintenance, as it can make all the difference when you’re working beneath a heavy vehicle.

By taking the time to bleed your floor jack correctly, you’ll ensure it performs reliably, keeping you safe and your projects on track. If you have any questions or need further clarification on the process, feel free to ask in the comments below. Your safety and the longevity of your floor jack are worth the effort!


How often should I bleed my floor jack?

You should bleed your floor jack whenever you notice decreased performance or air in the hydraulic system. It’s a good practice to do it annually for preventive maintenance.

Can I use any hydraulic fluid for my floor jack?

It’s best to use the hydraulic fluid recommended by the manufacturer to ensure compatibility and optimal performance.

What should I do if the bleeder screw is stuck?

If the bleeder screw is stuck, apply penetrating oil and wait for it to loosen. Be patient and avoid using excessive force to prevent damage.

Is it normal for hydraulic fluid to become discolored over time?

Yes, hydraulic fluid can darken with use, but if it becomes excessively dirty or contaminated, it’s advisable to replace it.

Can I use my floor jack without bleeding it?

While you can use it, bleeding is essential for safety and efficiency. Neglecting to bleed the jack may result in unstable lifting and potential accidents.

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