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Closer to home, there are quite a few cardmates who have encountered problems similar to mine. Since the trailer brakes are earlier than the main vehicle, most trailers now have a 16-ton brake pad and the vehicle is lightweight. When the brakes are applied under no-load conditions Tire prints and smoke. There are two consequences of this problem, ranging from premature abnormal wear of the tires. Severe rain and snow conditions are likely to cause tail slips! Cause unnecessary losses! The solution given by Wang Gong is it--adaptive valve. 
The adapter valve is connected in series on the control valve of the main vehicle trailer valve and the trailer relay valve! My installation position is at the gooseneck of the trailer. I find the control valve of the relay valve is disconnected. The red circle position is the inlet end, and the white color is the outlet end (the three end of the adapter valve is blocked, and the two are blocked. One) so lightly step on the brakes, the trailer is very soft, heavy stepping does not affect the braking force!
A friend asked how to install? There are two red and yellow pipes in the longitudinal beams of the trailer. These two lines are connected from the main vehicle to the trailer through the spiral pipe. All the way is to inflate the trailer gas cylinder, all the way from the main vehicle trailer valve to the trailer control valve control valve, is yellow! (The color varies depending on the car) Disconnect the yellow pipe (in a suitable position, easy to fit the adapter valve), connect the inlet end of the adapter valve (black solid line) from the direction of the host car, and the other end With valve outlet!
In this way, the brakes are lightly applied, the trailer is very soft, and heavy stepping does not affect the braking force!
Empty Semi-Trailer Braking Solutions
With the declining transport environment benefits, we should change the old bad driving habits of the past. The friends of the trailer should seriously learn about the new technology and new knowledge, use it reasonably, and reduce our operating costs! Take the road to prosperity! Did the trailer drivers ever face such problems - when the trailer braked and braked when it was unloaded, it caused tires to run and smoke? If so, you can't miss this article.