BMW 318 air conditioning pressures

Hello, greetings to all who help the brownillos like me.
The question is related to a BMW 318, my friend has one with a leak in the gas circuit; He already knows and has the piece in question to change, but he needs to know the gas charge procedure, and the amount to be put.
Understand some mechanics, and a lot of air conditioning and plumbing; I don't think you have problems. But you need technical data.
thank you.

Hello, you will see in principle, make a good empty of the system through a pump 2- The liquid oil for the motor and fluor

Thank you, I have communicated it to my friend, who in addition to thanking him for his help, has understood everything he has explained. I already commented that of plumbing and air conditioning (home and company, but not cars), understands a while, but an expert is always needed to solve doubts.