What is another name for the emergency brake?

The emergency brake is commonly known as the parking brake. This system is designed to hold the vehicle in place when it is parked, preventing it from rolling away. It's typically activated by a lever or pedal and engages the rear brakes, providing a mechanical means of securing the vehicle, particularly on inclines.

The term "parking brake" clearly reflects its primary function—to secure the vehicle when it is not in use. While it can also serve as an emergency brake in situations where the primary braking system fails, its main function remains related to parking.

In contrast, the other options refer to different components or systems in a vehicle. The power brake enhances brake pedal effort through hydraulic or pneumatic assistance, the dual master cylinder refers to a brake system design that improves safety by having two separate brake circuits, and the disc brake is a type of brake that uses friction to slow or stop the vehicle but does not encompass the broader functions of the emergency or parking brake.