Diaphragm single brake cylinder disc brake is a type of braking system commonly used in vehicles. It consists of a brake pedal that is connected to a diaphragm single brake cylinder, which in turn is connected to a disc brake rotor. When the brake pedal is pressed, it activates the diaphragm single brake cylinder, which applies pressure to the brake pads, causing them to clamp down on the disc brake rotor, thereby slowing down or stopping the vehicle. This type of braking system is known for its reliability and effectiveness, and is commonly used in high-performance vehicles and heavy-duty trucks.