The brake of the pneumatic hoist is mainly a drum brake, which uses centrifugal force to reduce the speed of the braking shaft and achieve the purpose of braking. 

Drum brakes have the advantages of simple structure, convenient maintenance, good heat dissipation performance, and safe and reliable use, making them widely used in pneumatic hoists. In addition, there are disc brakes and spring brakes, which have different application scenarios.

When the pneumatic hoist is working, the main function of the brake is to reduce the rotational speed, thereby achieving the purpose of deceleration and braking. 

The drum brake reduces the speed of the brake shaft through centrifugal force, allowing the brake to achieve safe braking. 

At the same time, disc brakes and spring brakes also have their own applications, and they are usually used for lighter loads or situations that require frequent braking.

When selecting the brake for the pneumatic hoist, it is necessary to consider factors such as the structure, braking torque, and heat dissipation performance of the brake to ensure that the pneumatic hoist can work safely and reliably.