配置：主线一根、传感器延长线四根、ECU控制器一个和ABS调节阀三个（组合一体）。

三桥半挂车，根据前、后车桥四个车轮的传感信号，刹车气路控制六个轮的刹车制动，起到防抱死、防侧滑作用，有效缩短刹车距离
 

ABS 4S/3M Trailer ABS 4S/3M: 

Configuration: one main line, four sensor extension lines, one ECU controller, and three ABS modulator valves (integrated). 

For a three-axle semi-trailer, based on the signals from the four wheels on the front and rear axles, the brake air circuit controls the braking of all six wheels. This helps prevent locking and skidding, effectively shortening the braking distance.