1. A braking system located at the rear of a vehicle, bicycle, or motorcycle
The posterior brake on my bicycle needs adjustment.
O freio traseiro da minha bicicleta precisa de ajuste.
2. In aviation or nautical contexts, a braking device positioned toward the rear of an aircraft or vessel
The posterior brake system helps slow the aircraft during landing.
O sistema de freio traseiro ajuda a desacelerar a aeronave durante o pouso.