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Where do the vacuum lines of brake booster goon a 1994?

1. The main vacuum line from the brake booster goes to the intake manifold.

2. There is a check valve in the main vacuum line that prevents air from leaking in when the engine is off.

3. There is also a vacuum reservoir that stores vacuum for the brake booster when the engine is off.

4. The vacuum reservoir is connected to the main vacuum line and to the brake booster.