Quote Originally Posted by Ross
To be safe temporarily install a mechanical gauge and see what you get.
If pressure remains low you probably have worn bearings or a tired pump.
I've seen lots of motors given new life by replacing these items when the warning start to appear.
M30B35 pumps are extraordianarily reliable- and $400 to replace. I've suspected mine for a while now due to noise. Best thing to do is stick a gauge on and keep an eye on the actual pressure in all scenarios before going to the trouble of finding out you over-reacted... the canister is well-known to cause low pressure for the first 10 seconds however- I suggest u check the write up on www.bmwe34.net