Why the toilet button does not sink to the end and to completely drain it must be kept
Previously, when you clicked on the button on the drain tank fittings, the button was drowned to the end and the entire volume of water in the tank was drained. Now the water is partially drained, only for the period of forced pressing and holding the drain button. To make a complete drain of water from the tank, you need to hold the drain button for a few seconds. What regulates or establishes the normal mode of water discharge and described above?
Sergei
Expert Answer
Good day, Sergey!
To eliminate the cause of the malfunction, you will have to remove the tank cap. Most often, it does not have additional fasteners and is prevented from shifting by a single button, which must be unscrewed counterclockwise. After accessing the inside, carefully inspect the drain mechanism drive. Unfortunately, you did not specify its type, so we will try to describe a way to fix the problem on one of the common designs (see the figure below).
Very often, the malfunction described by you arises due to spontaneous displacement of the pressure rod. In the figure, it is represented by a red part. In addition, excessive force when pressing the button could provoke a shift of the locking ring (round part of blue color). Less commonly, this type of trouble happens when you move the drain switch tab (it is indicated by an arrow).
In this case, it is simple to repair the drain mechanism - it is enough to fix the stem one or two divisions higher, install the stopper in the recess on the body of the inner pipe, and return the tongue to its place.
If the malfunction is caused by damage to parts of the drain valves, they can be tried to be repaired with epoxy resin or the entire assembly can be replaced. Fortunately, the drain mechanism has a low cost, and you can find it in any building market.
Vik_Tor 
Sergei
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