Quote:
Originally Posted by pizzachef
There would have to be some kind of delay to open the valve to "locked" or "unlocked" for some length of time, and then have the valve close to both circuits. That would prevent a small leak in the system from draining the vacuum reservoir. Maybe that was impractical to do.
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Part of the reason that it is impractical is that the selector valve and the vacuum reservoir are not co-located. In order to work effectively, the valve would need to be at the reservoir. As designed, the valve is a one end of the system, the reservoir is at the other, and all the "leaks" are in between.