The brake booster line is for vacuum only, and will not cause any problems removing it. The other two lines are fuel lines for the fuel cooler. The 560SL has a fuel cooler in the A/C refrigerent line. You can disconnect those two small lines without affecting the A/C system. Be careful as there could be residual fuel pressure in the lines, but once you break the coupler loose and bled it off, no big deal after that. Don't unscrew the large nuts, as that indeed will cause the refrigerent to leak out.