On my 95 E320 (I don't think your car would be different) the line comes from the brake booster to the engine. The line looks more like a tube and in the middle (around half way from the booster to the engine) there is a check valve. Mine had a crack on the bottom side. But you should check the whole line just in case.
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Mike
90 300D 511k
95 C280 133k
14 BMW 528i
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