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post #1 of 8 (permalink) Old 03-20-2011, 11:39 AM Thread Starter
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Power Steering Has No Assist

Car: '91 Audi 90 quattro 20V

I branched off the other thread for this because I'm stumped and not sure if it's a hydraulic issue or not.

The steering in my 90 feels like it has no assist. There is no grinding or unusual noises, but the wheel is very hard to turn at low speeds. My cousin and I replaced the high pressure hydraulic hose and bled the whole system and filled it with fresh Pentosin 11S. We even took the reservoir tank out and cleaned it with mineral spirits because it was pretty gunky. The Pentosin that came out looked dirty, but a little less so than the last time I bled it. The first time, I used a turkey baster to siphon fluid out and cranked the wheel to get more, but this time we used two funnels attached to the in and out hoses that go to the tank. We put fresh Pentosin in one hose and got dirty Pentosin out of the other. Once we stopped getting air and the Pentosin started looking less and less dirty, we reattached the tank and filled to the proper level.

So basically we're stumped. It's coming down to just replacing parts and hoping for the best. I'm guessing the bomb is bad because the brake light on the dash comes on when you start it. If you push the brake pedal hard while it's running, the brake light comes on if it went off, and the pedal vibrates slightly (ABS? Seems like too slight of a vibration for that, but I'm unfamiliar with that) and then when the pedal can't go lower, the vibration stops and the brake light on the dash goes off. If you drive it a short distance, the "ABS Off" light comes on. Pressing the switch for the rear diff lock doesn't appear to do anything either.

So now the options: Power steering/hydraulic pump, hydraulic pressure accumulator, or something else?

Troy
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post #2 of 8 (permalink) Old 03-20-2011, 11:50 AM
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Hey Troy, just as an idea. What are your thoughts on Pentosin vs. VAG 002000 (or Febi 6162) compatibility?
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post #3 of 8 (permalink) Old 03-20-2011, 02:20 PM Thread Starter
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I didn't even know there was such a thing as Febi 6162, and I thought VAG 002000 was just a part number. I was using 20v.org -> Regular Maintenance -> Mineral Hydraulic Fluid for reference. I'm assuming Pentosin is compatible with these hydraulic systems since I've mentioned that I bled it and filled it with that before and no one said anything. That, and the entire system has been bleed and cleaned, so even if something else was originally there, it's just Pentosin now. What do you think?
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post #4 of 8 (permalink) Old 03-20-2011, 07:35 PM Thread Starter
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Another thing I forgot to mention: sometimes when you start it up or after you drive, there's the definite smell of something rubber or maybe plastic burning. I'd normally think belt, but I haven't heard anything under the hood that makes me suspect it.

The steering worked well before we fixed the leak by replacing the hose. It didn't work well if the Pentosin level got too low though.

We loosened the banjo bolt for the high pressure hose on the pump with the engine running and the fluid just trickled out. It didn't seem to have much pressure to it.
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post #5 of 8 (permalink) Old 03-20-2011, 10:54 PM
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Wow....Troy it sounds like you've taken every step properly...but I'm suspecting the hydrualic pump might be worn and failing aswell as the brake bomb. See these cars are so touchy when it comes to even a micro of air in the 2 systems. But ya I'm still suspecting the those 2 components. I've never had those problems and never really sourced out where to get them. But I have 2 coupes right now...one I have completely stripped down to the bare shell and my DD. If I don't need the hydraulic pump or brake bomb from my stripped coupe...I'll save it for ya ok? Let me know how you make out ok bro. Keep fighting the good fight...it will be worth it in the end...trust me...BTDT!!


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post #6 of 8 (permalink) Old 03-20-2011, 11:02 PM Thread Starter
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Thanks, Greg! I was hoping someone could tell me it was either one or the other, but I was honestly suspecting both myself. I very likely will fix it, if for no other reason than I probably couldn't sell it for much if someone jumps in it and immediately notices they have to be a bodybuilder to move the wheel. Haha! Let me know if you have those parts and don't need them. Private message or email me a price, and I can try to work something out. Thanks again!

Troy
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post #7 of 8 (permalink) Old 03-21-2011, 08:01 AM
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ok guys , i'm a e30 bmw guy, new to autounion , & i just got a manual on cd - wish i could read german - i'll have to reload it - for english- but anyway
do u have speed sentive steering ? maybe the sensor has gotten un pluged ? or how ever it works ?
just a thought
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post #8 of 8 (permalink) Old 03-21-2011, 09:20 AM
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Hey royemello...no these older audi's never had the speed sensitive steering like the older Bmw's or porsches. The audi's have a hydraulic assist pump and a brake bomb (brake accumulator) for constant high pressure in the steering and brake system.


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