It appears to be yes - I am in the middle of repairing a vacuum leak on my 535d which looks it it's caused by that red and black striped hose being completely severed down near the engine mount. I was very puzzled as to where it was going but figured out eventually that the car has active engine mounts. I had never even heard of such a thing! Anyway, I'm replacing all the vacuum hoses under the intake manifold because I have it off just now doing the glow plugs so will replace the red and black one now too. Hopefully it's the only one that is causing the leak.
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