XSeries-forum

My understanding is it should pull a vacuum but it helps to operate other things as well like turbo actuators and such and as you don’t seem to have other problems then maybe it is a servo problem like Allen suggested

Positive pressure sounds completely wrong given all of the diagrams say ‘vacuum’, and you need a vacuum to make the servo operate correctly.  If the pump is putting out pressure rather than sucking it away then it would point at that being the probable cause.  Could be a seal or ‘O’ ring failure.

Newtis.info has the instructions.

If it is blowing then you have a problem i would say.
It must be the pump but i have not had one fail and blow instead.

Ok thanks I'm out there today so will let you guys know

Now do you think this could be the problem



Just ordered one from bmw £76 pick it in morning,

Thanks for all your help  :beer2: :beer2:

That might just be it  ) ) ) ::)

Interesting!  What was it rubbing against?  That almost looks like there was either a routing issue or a missing clip?

£76

I think  there's a missing clip as I only undone one on the back ,I will have to sort one before finishing it off.

[quote="Horizon"]
£76

[quote="X5Sport"]
[quote="Horizon"]
£76

Of course everyone knows that, don’t they 

Had this on our e46 325 - on that engine there’s a valve which is called the “sucking jet pump” which is basically a one way venturi valve which is attached to the end of the hard vaccuum pipe which feeds into the servo (runs under the scuttle). It’s a sealed unit made of plastic - and in ours, the top/lid had started to separate. When I touched it, it fell apart. Replaced that and it’s been fine ever since - it was falling apart gradually - so mostly had brakes and then occassionally didn’t! On the e46 m54 engine the valve is located by the passenger side of the engine - by the scuttle - think you’ll have a similar set upnon yours - is part no 1 on the m54 engine on the below diagram:

http://www.realoem.com/bmw/enUS/showpar ... Id=11_2885

Ok brakes all fixed now as I was there I fitted a new manifold, all new gaskets, so I hope this us the end of it next  week MOT,

Thanks guys for all your help

Got a new mot today ,here's to another year's  motoring in the 5