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 - A City Guy's First Tractor - by Fred Hambrecht. After living in apartments in Atlanta for more years than I care to remember, the wife and I decided to move to the country. Humming "Green Acres is the place for me..." we purchased a 29 acre tract about 60 miles south of Atlanta. Next came the house, I could talk about that ordeal for another two weeks... But, I want to talk about my tractor! We didn't even own a lawnmower, and all of a sudden we had enough grass to feed all the starving children of the bovine world. Naturally, I talked
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