What type of mechanical brake is generally activated by a pedal or lever inside the vehicle?

The parking brake, also known as the emergency brake or handbrake, is specifically designed to be activated by a pedal or lever located inside the vehicle. Its primary function is to keep the vehicle stationary when parked, preventing it from rolling. In many vehicles, this brake operates independently of the main braking system and is typically engaged by pulling a lever or pressing a pedal, which creates friction to hold the vehicle in place.

Unlike other types of braking systems, such as power brakes, which assist in braking using hydraulic force when the foot is applied to the brake pedal, the parking brake provides a manual method for securing the vehicle. This manual activation is crucial for safety, particularly during situations where a vehicle is parked on an incline or when it needs to remain stationary temporarily.

Disc brakes and dual master cylinders refer to components of the primary braking system used for regular stopping while driving, rather than for parking. Therefore, the parking brake stands out as the correct answer, as it fulfills the specific criteria of being activated by a pedal or lever within the vehicle.