OK, how do you remove the rubber vacuum lines, there are no clamps but they are locked on very tightly. I didn't want to break the plastic connections - any advice?

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2007 550i, Sport Premium, Silver Gray Metallic, Gray Dakota, Navigation, Cold Weather Package, Comfort Access, Heated Rear Seats, HD Radio, Xenon

2007 X3, 3.0si ///M Sport Premium, Monaco Blue, Gray Dakota, Navigation, Cold Weather Package, Xenon

2002 X5, 3.0i Sport Premium, Titanium Silver, Gray Dakota, Cold Weather Package, Xenon, just a winter vehicle