Re: 750i Power Steering/Brake Booster Pump ? (archive)

Have you noticed the ride height in the rear being too low?
It sounds like you have a leak somewhere in the Load Leveling system for the rear struts. Could be the fluid lines, could be the accumulator.
I would recommend you check very carefully under the rear of the car to see if you can see anything leaking.
Perhaps you can park it on a flat, clean spot of pavement and let it run for a minute or two, shut it off and see if there are any drip spots on the ground.

I recommend you get this fixed fast, as you don't need to be loosing your brake pressure and power steering assist, and as I'm sure you've noticed, the Pentosin hydraulic fluid isn't cheap. Also, there is a potential hazard of this hydraulic fluid leaking onto hot surfaces (such as the exhaust pipes) as it is flammable. It's not highly flammable like gasoline, but it will ignite into flame. I once had a small leak from my power steering hoses where the fluid came in contact with the hot surface of the engine block and ignited into flame. It wasn't very serious -- it was easily extinguished by blowing on it -- but my policy is no flame is better than flame.

Jason Ferguson

I have a 1988 750i with over 150000 miles.
I recently have lost all of my PwrSteer/Brake fluid from my Booster Pump. I have circulated over 2 liters of fluid through it and cannot see where it is going ?
But I can almost hear it being sucked out of the Booster
can as I pour it in.
And I have lots of oil on my back bumper now.

Any suggestions as to where the fluid is going or what to look for ?

ALSO: I am in Cleveland Ohio. Are their any good Independent BMW Techs and clubs around here ?

Follow Ups:

[ Follow Ups ] [ 7-series Message Board ] [ Msg. Board FAQ ]

Questions, comments, or problems, please visit the Roadfly help desk.