The Euro should be the same as the US-Spec. Could the problem be from the resistor? How can I test it? Oh by the way, can you explain its location better... or better yet you could just post a pic of the location. Not quite sure of where the brake booster is. Thanks!

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1999 Mercedes-Benz S600, 103K miles - garage queen
1988 Mercedes-Benz 560SEL, 89K miles - daily driver
2007 Hyundai Sonata Limited, 31K - daily driver