Clutch problems of the 2008 BMW 550

2008 BMW 550i. Consumer states when normally down shifting to reduce speed, the cruise control would not disengage when the clutch was pushed in the consumer stated when the clutch was released in a lower gear, it maintained the higher speed and merely revved the engine. The consumer learned he could not down shift, but had to break instead. The consumer and the BMW technician went for a test drive and it was soon discovered that the clucth had to be held for about six seconds in order for the cruise control to disengage. The dealer informed the consumer the delay was apparently within the specifications.