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<i>I have had my car for fifteen years and my only complaint is the <b>heavy steering</b>, heavier even than my motorhome.</i>
Heavy steering? You must have a problem in the steering because my steering is as light as a feather at low speeds. It's fantastic! Certainly one of the best features of the car. It is speed dependent though so it still feels solid at higher speeds.
Your system probably "thinks" it's at high speed all the time and thus at low speeds it's heavy. It probably happened so gradually that you hardly noticed, like needing glasses.
The Bentley's manual says, "An electronic/hydraulic valve on the steering gearbox controls power steering assist via the Servotronic electronic control module".
Bentley's lists 3 things for "Heavy Steering":
1-Worn upper strut bearings;
2-Incorrect tire pressure (nahhh)
3-Power steering system faulty
For #1 it says to replace the bearings of course. For #3 it says to check the power steering fluid level and test system pressure.
Also, a 750 has a LAD, self-leveling rear suspension system that shares a pump and fluid with the power steering system. Don't want to insult your intelligence but, if you haven't already done so, check the fluid level and remember that it takes a special fluid. Depending on the year it takes either Pentosin CHF 7.1 or Pentosin CHF 11S. It says on the top of the canister which one it is. The dealer is the only place I've found this stuff and it's about $20/liter.
Hope this helps.
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