A method of assembling pushbuttons for a liquid dispensing system, in which each pushbutton comprises an actuation body and at least one other component assembled with said body in a given position, said method making provision for using bodies on which a positioning cavity is formed, and continuously supplying a station for assembling the bodies and the other components by means of a path for conveying said bodies, said path having a complementary profile intended to cooperate with the cavities in order to carry out the positioning of said bodies in said conveying path, so as to carry out the assembly of the other components on the bodies thus positioned during their conveying to the assembly station. The invention also concerns an installation for implementing this method, and a pushbutton assembled by implementing said method.