if you are overhauling, the parts should be decomposed, flushed, And dried. The channels and grooves should be blown through with squeezed air. Check the rigidity of the vacuum valve and the air valve and the valve seat. should there be dirt, it ought to be removed; If the control valve If the rubbe : https://www.storeboard.com/blogs/things-to-do/if-you-are-overhauling-the-parts-should-be-decomposed-flushed-and-dried-the-channels-and-grooves-should-be-blown-through-with-squeezed-air-check-the-rigidity-of-the-vacuum-valve-and-the-air-valve-and-the-valve-seat-should-there-be-dirt-it-ought-to-be-remo/3002386

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