My power steering on my BMW f10 2011 528i is not working

check the fan belts and power steering belt, also the crankshaft pully could be free spinning

and you need to replace it two months later, again.

Dexron III ATF is what BMW called for in the power steering pump in these models. However, GM no longer makes a type-III ATF!

Nice thing about GM Dexron specifications is that any higher numbered fluid meets the requirements of previous, lower numbered fluids. What does this mean? Siphon out as much as the old junk as you can. Refill with Dexron III and if you cannot find that? A common on the shelf *upgraded* synthetic fluid can be found in Dexron VI that more than adequately surpasses previous Dex-III specifications. So use with confidence! Pour and forget...

power steer belt/tensioners always break, but could also be down on power steer fluid (leaking on driveway?)

can you look and see if the belt that turns the power steering pump broke or is slipping or quit pumping or if the rack and pinion is conking out. it is 1 or the other . pump and a rack & pinion they both have to work to get power steering.

The pump itself may not be suppling enough power. If it's making noise it either the Rack or Pump.

SOUND LIKE POWER STEERING PUMP SHAFT BEARING IS SCORED.YOU CAN OVER HAUL POWER STEERING PUMP OR BUY A REBUILT ONE.

Yes There Is ONLY ONE PLACE for Power Steering Fluid.

ZF Gemmer Steering

The ZF Gemmer steering is permanently filled with oil. There is no drain plug.

ZF Rack and Pinion Steering Without Power Assist

The ZF rack and pinion steering is lubricated for its service life and therefore does not require servicing.
In case of repair, steering components on E21 vehicles are to be lubricated with a sodium-based grease, with a temperature range of -30°C to +75°C .
Calypsol D 4024 BMW Part No.32 11 1 116 929

Ball and Nut or Rack and Pinion Power Steering

Only reputable brand Automatic Transmission Fluid (ATF) of Dexron® III formulation may be used for the power steering and power steering pump.
In case of brief hydraulic noise after starting at low outside temperatures, we recommend replacing the red ATF with green CHF or LHM oil (see below).

ZF Ball and Nut Power Steering with H31 System

The approved oils for BMW models with power steering and the H31 brake booster system are identical with those oils approved for power steering without the H31 system except for the following:

E32 models with self-leveling rear suspension and mutual oil supply tank in the engine compartment.
Countries with very low outside temperatures (e.g. Canada) had their power steering systems filled at the factory with Pentosin CHF 7.1 since 9/87 through 9/91. This is also to be used on vehicles built before 9/87.

Since 9/91, vehicles now use Pentosin CHF 11S instead of CHF 7.1.

Pentosin CHF 7.1 BMW Part No.81 22 1 468 879
Pentosin CHF 11S BMW Part No.82 11 1 468 041

These cars are marked with a pertinent label located close to the oil tank.

LHM oils (green color) of the following manufacturers may also be used instead of Pentosin (CHF 7.1):
Shell LHM
Castrol LHM
Exxon LHM

The mixing of CHF, LHM oils and ATF is not permitted.

Pentosin CHF 4548 was used on vehicles built before 9/87 but is no longer available. However, mixing of Pentosin CHF 7.1 with residual quantities of Pentosin CHF 4548 are permiffed in these earlier vehicles. Mixing of these two oils is not permitted for E32/E38 vehicles.

The hydraulic system for power steering and power-assisted brakes must be drained as completely as possible when changing from one type of oil to the other.
All oil supply reservoirs are marked with the type of oil being used - ATF or CHF.

The power steering reservoir is between the engine and air filter intake. It looks as the image below.

when looking at the engine with the hood up, look to the right hand side for something that looks like this (#1 in the pic): http://www.realoem.com/bmw/showparts.do?model=ET37&mospid=47720&btnr=32_0957&hg=32&fg=20

it will be black in color, but don't confuse it with the oil filter housing. power steering reservoir will have a unique cap (#2 in the pic) that can be removed with your hand. the one that has the large nut on top is the oil filter. remove the cap and put in the correct fluid.

hope this helped.