What are the similarities and differences between through electro-pneumatic braking of EMU and traditional through air braking of rolling stock?

Structural differences and quality differences.

Electro-pneumatic brake

Refers to a "brake". Brakes that use electricity to control braking, release and maintain pressure, and use pressurized air as braking driving force can generally be automatically converted into pneumatic control when the electronic control system fails.

Compared with air braking, the main advantages of electro-pneumatic braking are good consistency of vehicle braking and release, small longitudinal impulse of train braking or release and short braking distance. The longer the train and the higher the speed, the more obvious the advantage of electro-pneumatic braking. ?

A brake with negative pressure air as the medium, the change of air vacuum degree to control the action of distribution valve, and atmospheric pressure air as the source of braking motive force. The difference between vacuum braking and air braking is that the latter uses pressurized air as the medium to control braking and release, and uses pressurized air to enter the brake cylinder to generate braking power source. Vacuum braking is only used on locomotives in a few countries in Africa and South Asia.

air brake

When the driver moves the brake valve to the push position, part of the compressed air in the main brake pipe is discharged to the atmosphere. At this time, the air pressure in the auxiliary air cylinder is relatively greater than the air pressure in the main brake pipe, thus pushing the main piston of the three-way valve to move to the left and blocking the passage of the inflation ditch, so that the compressed air in the auxiliary air cylinder cannot flow back.

When the main piston of the three-way valve moves, it drives the slide valve to move to the left to cut off the outlet to the atmosphere, so that the compressed air in the auxiliary air cylinder enters the brake cylinder and pushes the brake cylinder to move to the right. Through the transmission of the brake lever, the brake shoe holds the wheel tightly for braking.