The spring brake chamber is a part of the automotive braking system. It is usually installed on the drive axle of a car, and its function is to provide braking torque for the car.
The brake chamber is a device composed of an intake port, a cover, a diaphragm, a support plate, a return spring, a housing, a push rod, a connecting fork, clamps, and bolts, also known as a cylinder.

there are following type:

S-cam brake chamber

air disc brake chamber

wedge brake chamber

special brake chamber

slack adjuster

air&hydraulic brake actuator