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 - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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