just check the general condition of the pipe numbered 5 here...should have no cracks or wrinkles
Just tried the same on my brothers E39 and his pedal sinks the same as mine. So I assume this is completely normal.
i've done this with the engine off and experienced this same stiffening of the pedal...but once the engine was started the pedal gained its 'give' back...always assumed it was the vacuum assistance at work in the servo...weird.
I'm guessing DSC system has got air in it. Best way to resolve this is to hook it up to a DIS system and let it sort the air lock out.
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