Are you having braking problems? Usually the vauum booter has a large line that goes directly into the intake manifold. Sometimes it is clear, if it is amplified by a vacuum pump, in that case it will go into the pump and then there will be a line from the pump to the manifold. The reason they are clear if you have a mechanical pump is so that you will know if there is a diaphram failure, it will turn dark. What is the braking problem you are having?
Brian