Looks like a hydro unit issue (annoyingly common on 1 & 3 series 4 cylinder vehicles, but is also starting to rear it's head on the 6 cylinder cars) getting an Indy to check it out or someone with some coding software described elsewhere as a second line of defence if you want to do it yourself or get a forum member with the right software/hardware is the way to go to ultimately verify the problem.
The hydro unit or the 4cylinder units isn't too pricy around £170 odd (£1580 odd plus VAT on 6 cylinder cars) the car will after fitting need a brake fluid change but the repair kit for someone in the know is a straightforward operation and should take around 2 hours plus some coding.
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