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OK- here's the story. Power steering hose was leaking so I replaced it. When I replaced it, it would not bleed. No power steering. Talked to the local BMW dealer, and tech sad that he suspects I ruined the pump by not first priming it prior to bleeding. (?) I replaced the pump. And primed it before bleeding. Still no work..Do I decided to take it to the shop. They looked at it, said the power steering hose was collapsing. Refused to work on it any further. Charged $300 for that. I guess that means it's sucking hard, but not pressurizing on the other side? They proposed $5000 to fix it, including a new steering gear ("they go bad all the time"- yah right- same thing you said about the pump). The steering gear itself is $1800! So what do you do? It doesn't leak anymore... but won't bleed and has no power steering. Does the M5 have a unique steering gear? 535 gears are much cheaper, and I can find one used, or on EBay. What else might it be? All I did was replace the hose, and it was working before that. I've read things about having to bleed the suspension as well, but it seems to be pumping up OK., ??? help
 

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I know a lot of people have seen this post. No answers?
How about a simpler question: Can I use a 535 power steering gearbox on an M5, or is it different? It looks the same on the outside. Alternatively, what's the difficulty of rebuilding a box?
 

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I assume you replaced the high pressure hose. That hose has a flow restricter in the middle of the hose section and that resrticter could be blocked. I suggest you check the hose you installed and do a pressure check on the power steering pump
 
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m6bigdog
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