broken lines from brake booster

[banjoread]

1982 300D Turbo

Today I accidently broke two lines that connect to the "tube" (for lack of a better word) that leads out of the brake booster. These two lines are connected to the vacuum system and enter the "tube" about 6 inches from the brake booster. The plastic on the ends of the lines that connected it to the "tube" were very brittle and they simply broke off. The only thing I can notice now is that car does not shut off without pushing on linkage. What I'm wondering is what these two lines do and if car is driveable while broken? I have only run engine, haven't actually driven car since I broke them. Thanks for your help!