Quote:
Originally Posted by emerydc8
I have a friend with a 92 500E and he is having a noticeable problem with his brake pedal sinking significantly toward the floor as he starts the car. Maybe it is just the power of suggestion, by I noticed that mine is also sinking on startup. I suspect it has something to do with vacuum, but is some sinking normal (of course, I'm pressing on the brake when I start the engine). What could cause this to occur? Any ideas?
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Call me crazy but I'm going to guess that your brake pedal is sinking because you're stepping on it
In all seriousness, most if not all of my cars have done this at startup.