The most important function of the check valve is to maintain a vacuum in the booster while the engine is under load. While an engine may run with about 21 inches of vacuum while under no load, under full load there can be no vacuum available. Without the check valve if you needed to make a quick stop while the engine is under load you would have no assist from the booster.
To check the operation of the check valve, run the engine and then shut it off. After the engine has stopped you should have at least one full brake application with assist. Without being used a good system will hold vacuum at least several days.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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