Have any of you experienced any problems with the brake fluid level in your Q7? Mine has had 4 full top-ups in the last 6 months. There is definately no evidence of a leak - the dealer had it for two days and could not find a leak. There latest theory is that either the brake fluid is pushing into the booster and collecting there or its pushing back into the engine and burning up there?

Has anyone ever heard of this?
What else can I try to locate the missing brake fluid?

Thanks