I sent back the master cylinder, because it was broken, it had been over 2 months already, and I received a response through many other nonsense emails, asking for a second invoice, like that I have to receive an invoice for disassemble and one for mounting. I gave them everything they asked for, but this stupidity I have never heard. I called a bmw main dealer and asked them for a repair, no matter how many times they disassemble a piece and put it back, how many invoice they make, and they answered me, JUST ONE. I thought they were professional, but they come with all sorts of embarrassing reasons, just don't pay for the broken piece. I tried to get in touch with them by phone, but I have not succeeded so far. they have pretty good prices, but I prefer to pay more! but when I have a problem, I know I have with whom to solve it. I do not recommend their system for solving anyone's problems. they are the worst I have ever encountered. Everywhere in the world different parts of millions of companies are delivered, these days as if they do. so I can't say that they are more special. Only when you have a problem do you realize the professionalism they have or do not have. for me the ones from the autodoc germany do not have it.