Sorry, but I don't know what to call it other than a distributor...? From the brake fluid reservoir runs a hard metal brake line to a part that is attached to wall of the engine compartment opposite of the left front wheel. From this part, 4 additional hard metal brake lines go to each of the 4 wheels. On my 78 320i it was leaking from the bottom of what appears to be a cylinder within it (perhaps to equalize pressure?). I bought a 79 320i as a parts car and replaced this part from it (which was a pain in the ass because of the tight location and all the endless turns of a wrench needed to tighten all the metal brake lines). It worked OK for a couple weeks before this same part began leaking again... The parts car had low mileage (66,000) but it sat for 7 years, could the seals have rotted? Can it be tightened? Looking at the bottom of it, it would accept a large Allen wrench (10mm maybe), the kind with a hole drilled in the center. But where to find such a wrench? Anything to avoid climbing under my car to spend an hour flipping the wrench over and over for an hour tightening all those brake lines!
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