As discussed earlier, the vacuum source for my brakes no longer comes from the intake manifold, but from a mechanical pump run by the serpentine belt. Therefore, I was able to move the vacuum manifold that separates the front and rear brake systems down under the propane tank. I was also able to add a vacuum tank that will give me a reserve of vacuum should the engine stop. I will now be able to stroke the brake pedal several times after the engine stops and still have full assisted braking.
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