The Stovebolt Site Forums The Shop Area Driveline Vacuum line recommendations for Power Brake Booster

Some comparison from a big bolt: The Hydrovac booster is mounted on the frame below the level of the engine, mine is under the driver's side step. The vacuum line starts at the intake manifold and goes up to a combination inverted trap and check valve, it then heads down the firewall and along the frame to the booster. The theory for the loop/trap is to prevent gasoline vapor from condensing and running into the booster.