There are two braking methods for the mixer truck loaded by itself: Oil braking and air braking. This is everyone's technical question: why use air brakes?

空气制动器反应迅速，制动器粗糙，作用力大（气压高，多8个大气压）。

The air brake responds quickly, the brake is rough, and the force is large (high air pressure, more than 8 atmospheres).

除制动主缸，辅助泵和制动管路外，空气制动器还具有一个气泵（通过皮带连接到发动机），一个储气瓶和一个高压控制器（调节压力车辆）。这些部件需要大的安装空间和复杂的结构，并且为了确保性，后制动缸现在是气闸（成本增加和结构复杂）。

In addition to the brake master cylinder, auxiliary pump and brake pipeline, the air brake also has an air pump (connected to the engine by belt), an air reservoir and a high-pressure controller (regulating the vehicle pressure). These components require large installation space and complex structure, and in order to ensure safety, the rear brake cylinder is now an air brake (increased cost and complex structure).

因此，由于这些原因，大多数普通的油制动器都是中小型汽车。它们体积小，结构简单并且在自己的车辆中轻便。他们不需要太多的力量。近年来，中型车辆（载重量小于10吨，约19吨）的趋势已经出现。座椅下方的中型巴士配备了油刹。大多数空气制动器用于大型卡车，公共汽车和混凝土搅拌车。车辆空间大，所需制动力大，使用距离长，响应速度快，并且增加的成本没有反映在整个车辆的比例中。

Therefore, for these reasons, most ordinary oil brakes are small and medium-sized vehicles. They are small, simple in structure and lightweight in their own vehicles. They don't need much strength. In recent years, the trend of medium-sized vehicles (load capacity less than 10 tons, about 19 tons) has emerged. The medium-sized bus under the seat is equipped with oil brakes. Most air brakes are used on large trucks, buses and concrete mixers. The vehicle has large space, large braking force, long service distance and fast response speed, and the increased cost is not reflected in the proportion of the whole vehicle.

小型混凝土自动搅拌车的那种搅拌车使用气刹了解就是这样，希望对你有帮助。

The kind of small automatic concrete mixer uses air brake. That's what I know. I hope it will be helpful to you.