Afaik "pedal" was self-evident for Mozart in his fortepiano compositions. The difference: There was no pedal, but a knee-lever which had the same function. When you play on fortepianos you have to learn a kind of opposite "pedalling" technique because the dampers would go upwards if you rise the knee-lever. I'm sure that for Mozart himself the good taste was the criteria of how to use the "pedal". In one of Mozart's letters the knee-lever is mentioned as "Die Maschine wo man mit dem Knie drückt" (The Machine that is moved with the knee)