Larger aircraft have speed brakes which we usually pop if given a speed reduction by ATC or other situations where speed needs to be reduced or contained or a steep rate of descent is required.
they are noisy for PAX so instinct is to only use them if needs must.
some small aircraft have speed brakes some as a conversion some as standard. I think one of the moonies is fitted with speed brakes.
Most of the lift on flaps comes in the lower extension levels fully extended they are mostly drag so I can see the temptation to use that drag portion as speed brakes but its not really good practice
Pace