Thanks mferek, i had the exact same issue as you with my old 320i and hence my suspicion of it being the pump again.

However, I've just come back from a more thorough investigation where I had some better light shining in and it does seem fluid is coming out of the reservoir/hose...although not enough to make a mark on the floor as it solidifies somewhere further down the engine bay.

Going to order a reservoir and fluid to start work on it this week, hopefully that should do it. Will keep you posted.

BMW X5 4.8iS 2005

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BMW X5 E53, 4.8iS - 2005
Professional Stereo/Nav with DSP (modified BM54 module) - Converted to Eonon GA5166X with Reverse cam
4-Corner Air Suspension - Converted to BC Coilovers