brake boosting was an option when going in for a firmware update, I have tried it once the brakes couldn't hold it. The ability to adjust the tune with the cruise control stalk is very nice, when it was still under warranty you could put it in stock mode when going to Audi for service. Three different octane levels, plus valet.
If this is true then your brakes are fukked.
2010 XC90 exec, winter machine (V8 of course)
2004 RS6 official Canadian edition, Daytona grey, (best colour!), summer edition
2011 Q7 TDI, general alrounder