On an unrelated note, our '04 Vectra has a problem with the air brakes. When driving, the air pressure gauges will drop every 60 seconds from 125psi to 100psi. Then the air pressure will build back up, purge, repeat. We had the air dryer and purge valve replaced recently. At the time, every 30 seconds, at idle/stopped/parked, the air would purge, but, air pressure in tanks would stay at 125psi.
So, previous problem with air pressure while in 'park' was fixed. Now, with brakes not in park, air pressure in tanks drop. grrrrr! A leak somewhere? Brakes do work fine while driving.
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