I got the used pump, and although is very different, it is a Hella instead of a Bosch, the 12 V. motor is identical, the bipressure pump is different but it seems to fit in the PSE housing. Today after work, I am going to replace the whole pump and motor and test it. I have to make shure I attach the pressure side and the vacuum side in the correct port at the board. I have a question. Does this pump rotates one way only, or it is reversed depending on the demand? Also, who turns off the pump in case there is a leak (like my close assist vacuum actuator broke once and you could hear a Hisss... sound for several secondsat the driver's door), a timer at the circuit board?

Thank you all for your comment. By mistake I went to another forum and apparently I was talking a language too technical for them. Now I feel at home. Thank you very much. Darrel