Hi daddiojiggy, it sounds as though you're not familiar with the MB SBC system. MB isn't interested in "MAKING" you do anything. Remember, this is the worlds' first production "brake by wire" system, and it requires special attention. Gilly is right on the money. Don't attempt any repair/maintenance on this system unless it is first de-activated!!! This system will, at times perform a "Pre-Drive Check". In other words, it will momentarily pressurize the system to check for leaks. If this were to occur during service ( replacing brake pads ) it could result in injury/damage, etc. As far as vapors2k question? It sounds like the parking brake isn't fully released.