1. The main braking system of a vehicle that is designed to stop or slow down the vehicle during normal operation
The primary brake system uses hydraulic pressure to apply the brake pads.
O sistema de freio primário usa pressão hidráulica para aplicar as pastilhas de freio.
2. In aviation, the primary braking mechanism used for regular descent and landing procedures
The aircraft's primary brake must be inspected before each flight.
O freio primário da aeronave deve ser inspecionado antes de cada voo.