Hi,

Ok I have a 240d 75.

Car was after driving on freeway, coming to stop at end of exit, car would spew out massive amounts of smoke, and eratic idle, using rpms going up.

Had vacuum pump seals etc replaced - repair kit.

Great for one week - now lost door locks - Hard Brakes (no Brakes) when car is running (No Booster), Car spews out smoke again after a short drive and at operating temp.

Seems to be conflicting info on wether its the Brake Booster or Vacuum pump, Looking for a difinitive way to test.

Cheers
GS