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I'm no expert, but I think the R134 leaks out and air and moisture get in the system.
I think the "evacuation" removes the air and moisture from the system by creating a vacuum, then the fresh R134 goes in.
Yes, you have to evacuate the system because the air in there takes up space that could be taken up by the R134A. I used a hand-held vacuum pump to evacuate my AC system, it worked great. It just made my hand tired, it's a lot of pumping, but it only took about 15 mins.
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