My older 540i has developed a leak in this part
A new one is about US$1000(!) so that might be the entire brake assembly.
I think I can find this specific part from a wrecker but my usual garage said they won't install it since it might develop the same leak as my one and it is an important part.
I don't think it's risky since the mechanic can eyeball it before it's installed. So I am wondering if somebody here can recommend a Welly garage who are good BMW mechs and could do the job.