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They haven't shown any sign of not working. I am just curious now why the pedal sinks when the engine is started. Given the combination of electric charge pumps and return pumps, it's hard for me to tell. I've read somewhere that the vacuum is not even the primary mode for power assist on this car.
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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles
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