05545i

Hey guys i just changed my vacuum pump due to leaking. I had one question. The hard rubber hose that connects to the plastic hose from the vacuum pump basically disintigrated when i tried to pull it off. So i cut it off, and installed just a regular rubber line with some hose clamps. Now, it looks like it is a little collapsed while the engine is running, but the brakes feel perfect driving. Has great power assist. No hard pedal or anything. Should i bother replacing that hose with the BMW version? Does anyone know if BMW sells that one piece separate from the whole line?

EBMCS03

Yikes, I would... what of it keeps collapsing... or something else...

twh

The BMW part looks like hard plastic (on bwmfans.info). That will be dimensionally stable (i.e. won't crush and won't collapse). Once had a Benz and the vacuum hoses were hard plastic, about the diameter of a drinking straw. But, if you look at the cross section, it has three internal chambers (imagine the cross section as a circle with a Y placed in the middle of the circle). That way, the hose could be routed and not kink or collapse and still pass a vacuum faithfully.

turboawd

what type of hose did you use?
go to an auto parts store and get actual vaccum line hose, as they are more resistant to collapsing.

05545i

It is a vacuum/emission line. I "tied/clamped" at the bend so it cannot collapse anymore. It should be good.