How to flush and bleed your vehicle’s power steering systems

power steering bleeding

To know how to flush and bleed power steering system is crucial when you have the traditional hydraulic pressure steering system functional in your vehicle.

Power steering system functions either by hydraulic pressure or electric mechanism. But hydraulic pressure is traditional and still is the mainstream steering system though electric power steering is emerging in the automobile industry. It takes nothing more than turning the steering clockwise and anti-clockwise to move even giant rocks around.

But hydraulic pressure faces difficulty or becomes an inconvenience rather than a handy steering system if invaded by air. You can compress air but hydraulic pressure is a fluid generated mechanism and having air in the system is a huge setback. It can intrude in the fluid by any chance. Now the question is how to get your steering system rid of that hassle. The solution is to flush and bleed the power steering system.

And how to flush and bleed the power steering system is our lookout in this article.

How to check and find air in the system?

The power steering system is as smooth as a breeze but with air in it, this smoothness disappears and gets replaced by noise and requires labored steering. Whenever you are up to parallel parking, the noise becomes harsher and shriller at times.  

If you feel this uncalled for noise, it is high time to check for the visual proof – fluid level drop and the leak in the system.

If filling up the reservoir with the liquid removes moaning and groaning in the steering system, it is clear that the culprit is merely the drop of fluid level. But if the disgruntling returns with a significant fluid missing after a short while of the restarting the car, it is obvious that there has been leakage in the system. You Can Try To use Power Steering Stop Leak.

In this case, both flushing and bleeding the power steering system are the only rescue.

Careful Flushing

While flushing, pour the oil into the fluid reservoir over a coffee filter napkin so that metal particles get trapped.  Thus you can be sure that your pressure hose must be replaced with a new one.

At the time of flushing, do not go for the common fluid options – brake or carburetor cleaner and engine degreaser. Go for the manufacturer-recommended fluid for power steering.

Ensure all the port threads are not stripped after the assembly and pressure hose fittings. But don’t leave the hose loose to let air sneak in. Just maintain the authentic torque pattern while tightening the pump fittings.

How to bleed the power steering system?

Once you have become sure of a leakage in the system, the natural target is the pressure hose the hydraulic pressure functions through. The better solution to this is to replace the hose with a fresh one. But this will not suffice if you limit your fixing only into installing a new pressure hose. This is only half-done. To complete the leak fixing course, you have to flush and bleed the power steering system.

While turning the steering wheel right to left and vice versa several times will remove the air sneaking into it, bleeding will require something more than that. Let us break the full process into bites for your better understanding.


Inspect the power steering system and make sure that hoses are not into direct contact with any part of car or truck. And those links are tight enough not to allow air in.


Now, check the steering fluid status and the temperature – hot or cold. The manual will guide you in this connection. Turn the right and left to trace if the fluid grows any amount of foam – a sure sign of air into the steering system.


If the fluid level is low, fill it up sufficiently with the prescribed fluid.


Take some penetrating oil to apply on the bleed valve. After that, push a tubular vinyl through the one end of the valve. To make the process a breeze, raise the wheels at a workable height with the help of a jack stand.


While entering vinyl tubing into the one end of the bleed valve, keep the other end in a dedicated container. Thus how the bleeding will be effective and old fluid along with air will get out of the system to the last particle.

But a crucial thing to keep in mind that to clear the air and fluid out, you cannot make the system run out of fluid. Follow the bullet-pointed instructions below to bleed the steering efficiently:

  • Restart the engine
  • Force open the bleed valve partially
  • Move the steering right and left repeatedly for several times
  • Add new fluid closing the bleed valve properly
  • Reverse the full course until you become sure that the system is air free

In case of new fluid intake, you can run the return line putting into the fluid reservoir. Thus the system will keep free from the danger of drying out.

Read More :

Verify the Bleeding Result

If everything has gone right, you find the following factors right in place.

How to bleed Power Steering System the RIGHT WAY! ( YouTube Video )

Learn More :

Article Source: Mobiloil

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