Audi A4 noisy power steering pump

Russell Owner/Technician New Zealand Posted   Latest   Edited  
Unsolved
Chassis
Drivetrain
2006 Audi A4 Quattro Avant 2.0L (F BPG) 6-spd (02X)
Noisy Power Steering Pump

Aftermarket one was noisy. System flushed and correct fluid used.

Replaced with genuine Audi pump as advised by power steer repair shop.

New pump noisy as well​.​ Have replaced intake hose from reservoir and cleaned filter in reservoir.

Carried out bleeding process. Checked for air leaks before pump. Flushed all lines and cooler.

Still noisy and does look like tiny air bubbles while working steering.

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Glenn Owner/Technician
Texas
Glenn
 

Hi Russell, I would be critical of the return side also. I have had hoses fail the internal liner and create a restriction. One I had on a BMW with a hydraulic P/S driven fan had me going for several hours because an internal chunk of hose was restricting the flow. Hope this helps you.

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Russell Owner/Technician
New Zealand
Russell
 

Hi yes I did question the pressure side ,as it does seem restrictive to blow through the high pressure hose from the pump to the steel line​.​But have been told by power steer shop that they have restrictors in the hose.

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Glenn Owner/Technician
Texas
Glenn
 

Hi Russell, I question that they said there are restrictors in the hose. That does not sound plausible to me. Normally any restrictor or regulating valve is on the pump itself.

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Russell Owner/Technician
New Zealand
Russell
 

Hi there is a restrictor in the return right at the end of the hose where it attaches to the reservoir​.​But there also seems to be something in the high pressure line as you can see 2 lumps in the center of the hose.

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Ralf Service Manager
Oregon
Ralf
 

I would recommend doing a true system flush, meaning uncouple the reservoir and run the suction hose into a container full of fresh fluid, run the return hose into a waste container, and run the system while turning the wheel. Just draining, filling and bleeding won't do it.

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Dan Diagnostician
New Jersey
Dan
 

I have had several stubborn power steering systems over the years act the same way. Somewhere along the way I picked up the trick of pulling a vacuum on the system for about 15 minutes and it has worked like a charm each time I've had to resort to it.

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Stuart Mobile Technician
Illinois
Stuart
 

How is the steering? Does the wheel turn smoothly or is it just noisy?

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Russell Owner/Technician
New Zealand
Russell
 

Hi ,it works fine ,just very whiney pump

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Obie Technician
Washington
Obie
 

As stated pulling a vacuum in the system is an excellent method. It does two things, first it can remove air bubbles, and second, if it simply makes more air in the system there is a definite leak on the suction side. Any power steering system should hold vacuum.

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Russell Owner/Technician
New Zealand
Russell
 

Good suggestion,thanks will give it a go.

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Max Owner/Technician
Australia
Max
 

I had an audi with the same issue and had to change fluid reservoir we cleaned it multiple times but still noisy, changed reservoir and no more noise

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Mihail Technician
Maryland
Mihail
 

Agree with what Max said. I also remember an Audi with a noisy new pump. The noise went away after replacing the reservoir. We also thought the old reservoir filter was clean. Another time it was the suction hose sucking air in and the pump making a lot of noise. Took me awhile until I realized how soft and swelled the suction hose was, not sealing and allowing air to get in and mix with the…

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Russell Owner/Technician
New Zealand
Russell
 

Thanks for that​.​The A4 one mounts on the inner guard and can remove the internal filter from the return side and clean it. Pretty much no hidden surface on the inside when its out so is easy to clean.

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Gregory Owner
Georgia
Gregory
 

I have seen Hondas do this due to the filter/screen in the reservoir being clogged, maybe Audi has this too?

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Louie Technician
New York
Louie
 

Hi Russell try lifting the front of the car leave the reservoir cap off with the car warmed up and idling turn the wheel lock to lock when the bubbles clear the system is bled out. this always worked for me .

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Charles Technician
California
Charles
 

There is a service bulletin #2022583 on how to verify if you have air in the system and how to bleed it. I would still verify first that the suction line from the reservoir to the pump is not squeezed, pinched, twisted, or the inside liner of the hose has collapsed, causing any reduced fluid flow.

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John Technician
Ontario
John
 

As others have said, could be sucking air on the feed side to the pump. Many Hondas do this at the oring on the inlet elbow thingy.

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