Caused by worn carbon brushes in the motor its a commont fault you can take it off remove three screws holdin the back end on
blow it out with an air line and refit it but realy needs brushes replacing
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sounds like your car could be possessed.
it may be a dead battery? in car or fob.
if you are positive the replacement pump is good and you have enough fluid and no air in system.
then it may be the steering linkage (a rusty stiff joint) will do that.
has the car ever been in an accident?
i've had a similar issue with a 99 M3. really stiff steering. i thought i was getting old and weak.
I was chasing another problem when i discovered a solution for my stiff steering issue.
Most of these vehicles have a valve that helps control steering pump fluid flow at various speeds.
i.e at higher speed you want stiffer steering. at low speeds easier steering. however, how does the pump known your going faster?
Note: all bmw steering hoses leak...
As your car ages, so do electrical contacts, especially in harser climates.
I used eletrical contact cleaner and di-electric grease to solve an intermittemt ASC problem.
This also cleared up the steering issue.
get some electrical contact cleaner and some di-electric grease. pop your hood and clean as many electrical connections as you can and apply a little di-electric grease after the contact cleaner drys.
even do the dme.
Note: I have replaced the power steering rack twice before i discovered this fix. You may also fix some other issues in the meantime.
electrical contacts may be the biggest problem source for most newer vehocles since they tie everything together.
There are 2 things that cause power steering to go stiff. The power steering pump itself either from failure or "lack of fluid" and the rack and pinion assy under the car.
Most of the time the failure is the power steering pump itself. The teflon rollers fail inside the pump and it either stops providing an output pressure or it seizes up. You can loosen the power steering pump belt then try to rotate the pump by hand. It should move by hand. If it feels like it is intermittently locking up as you rotate, it the teflon rollers have failed and the pump will need to be replaced.
bad electrical signal to the pump. pumps thinks its going fast. the valve that controls the fluid flow to make steeering stiffer at higher speeds is confused.
use electrical contact cleaner and d-electric grease to fix contact problems.
pop the hood and cleans as many connections as possible, let dry and apply a small amount of di-electric grease to those connections, then re-connect the plugs. even do the dme connections to the main wiring harness.
this will solve many electrical contact problems seen in older cars.
If the wheel binds up or you encounter harder steering in one direction but not the other, it's your rack. Check for leaks, is it from the connecting hose or the rack itself. Can't find it? It's usually on the bottom rear of your engine,a tie rod on either side will attach to your steering knuckle. If your steering is stiff while wheel is centered or at maximum lock it's your pump.
Never worked on a mini in particular. Doing a quick google search and pumps (minus labour) seem to be 350-450$ depending where you go, unless there's some crazy book time i'm unaware of, 1300$ seems pretty steep.
Is there a noise when you turn? If there is, jack up the front end and remove the cap off your power steering resevoir. Slowly turn the wheel from lock to lock, while the engine is running, to bleed any air out of the system If you replace one or the other, don't forget to do the above step.
that whining noise is definately your power steering pump. the earlier models eg 2001-2003 just have noisy ones. so they say, if that noise become really excessive; its an early warning that its gonna fail. the newer pumps are much quiter, but i was quoted approx 1200+ CND for a new pump. I have a 2003 cooper, and the whining noise is loud. only once has the steering been really stiff, but i resolve that problem by restarting the vehicle. watch out tho, the power sttering could fail on you while your driving around a corner, and if you dont have both hands on the wheel, you'll go strait.
MOST LIKELY THIS IS THE POWER STEERING PUMP AND THE ELECTRIC ASSIST FAN UNIT CONNECTED TO IT. OFTEN THE FAN COVER WILL OR CAN GET CLOGGED, BUT MORE LIKELY IT IS THE PUMP. IF IT GOES OUT IT USUALLY DO SO SLOWLY. THE STEERING WILL BE HARDER BUT YOU WILL BE ABLE TO STEER. THE NORMAL COST FOR THE REPAIR IS $1000 WITH LABOR. IT DOES NOT TAKE LONG, BUT CONSIDER BUYING THE PART ONLINE AND DOING IT YOURSELF OR TAKE THE PART TO A COMPETENT GARAGE AND HAVE THEM DO IT.YOU COULD SAFE HALF THE COST! REALLY. BH