What are the easily confused fault manifestations of damaged trailer air chamber membrane

Trailer air chamber membrane damage is a high-frequency fault in overseas fleets, but many symptoms are easily confused with other brake problems. Misjudgment by drivers and maintenance personnel can delay repairs and even leave brake safety hazards. The first thing that is most easily confused is that the brakes become soft and the braking distance becomes longer. Many people's first reaction is to directly determine that the air pipe is leaking or the joint is loose. In fact, after the diaphragm cracks, the pressure is released from the damaged position during inflation, and the pressure cannot be increased when stepping on the brake, resulting in soft braking. The difference is that if the joint leaks, you can usually hear a continuous hissing sound, and if the diaphragm is slightly damaged, it only leaks when stepping on the brake. The abnormal noise disappears when releasing the brake, and static pressure maintenance looks normal. Secondly, there is unilateral brake dragging on the trailer, which many maintenance technicians directly attribute to the failure of the brake return spring, brake shoe jamming, and membrane damage. After the membrane is damaged, the residual air pressure in the air chamber cannot be completely released, and the brake pads are slightly attached to the brake drum. When running, the wheel hub becomes hot, fuel consumption increases, and the symptoms are almost the same as shoe jamming. It is necessary to remove the end cover of the air chamber to distinguish. Simple jamming can generally be manually reset by removing the adjustment arm. Damaged membranes will be accompanied by abnormal fluctuations in air pressure when stepping on and releasing the brake. Another easily confused issue is brake deviation. Many people first suspect uneven wear of the left and right brake pads, rust on the brake camshaft, and damage to one side of the diaphragm, which can cause inconsistent braking force on both sides. When braking, the vehicle tends to deviate towards the intact side, and there is no obvious air leakage on the outside. During testing, the degree of deviation is different between light and heavy braking, and the camshaft sticking deviation is stable every time the brake is applied. In addition, the pressure drop of the dashboard is fast, often confused with water leakage from the air reservoir and sand holes in the pipeline. When the diaphragm is widely damaged, the pressure drop rapidly when the brake is applied, but slowly when the brake is not applied. Daily troubleshooting can start with a pressure holding test, monitoring the location of air leakage by pressing and releasing the brake, distinguishing between static air leakage and air leakage during braking. Due to limited spare parts at overseas construction sites, it is important to identify the symptoms of the fault, avoid blindly replacing adjustment arms and brake shoes, reduce the consumption of ineffective spare parts, and ensure stable cross-border braking.