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?