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 - Diagnosing Engine Difficulty - Diesel Tractors - by Staff. The following suggestions are listed for your assistance. You can make simple adjustments on your tractor that will improve its operation and save you the time and expense of hiring someone to do it for you. Always make one adjustment at a time, and if the adjustment made does not improve the condition, return to the original setting before proceeding to the next adjustment. Hard Starting Cold air temperatures. Insufficient fuel.
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