Final answer:
The subject of this question is Technology. It is asking about the components of a brake system, specifically a foot brake and an 'emergency' or 'parking' brake.
Step-by-step explanation:
The subject of this question is Technology. The question is asking about the components of a brake system, specifically a good foot brake and an 'emergency' or 'parking' brake. A foot brake is the main brake that a driver uses to slow down or stop a vehicle, while an emergency or parking brake is a secondary brake that is usually operated by hand or foot and is used to prevent a parked vehicle from moving. These components are important for vehicle safety and control.