[Vanne]

I had the one from Karbonious (beautiful box that), now running VAC racing box, much, much more raw, Id be bleeding the brakes/clutch at the same time, using some proper fluid.

plug a code reader into the car and see if there are any cruise control specific codes, I did hear of a similar issue with someone across the pond in the UK. might pay to have a sniff around on that /other/ z4 forum for the issue with the cruise control.