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Air Suspension Common Faults

Publish Time: 2023-06-07     Origin: Site

1. No air in all air bags


This situation is relatively simple to check, as long as we understand the air path structure of air suspension, we can start from where. The air source of the air suspension is connected by the brake system, and stored in a special air reservoir through a pressure protection valve. When working, it passes through the filter to the core component of the air suspension - the height control valve, and then to the left and right air bags.


The reasons for this may be:

1, air suspension special air reservoir no air or pressure is very low, in order to ensure that the brake system has enough pressure, when the trailer air pressure is lower than 06MPA, the pressure protection valve will suspend the air supply to the air suspension cylinder;

2, the air pipeline is blocked or discounted, but gas;

3, height control valve connection rod off;

4. Height control valve is damaged.


The solution:

1. Adjust and replace discounting and blocking gas pipes.

2, adjust the installation height control valve connection rod.

3. Replace the height control valve.


2.The air bag has air but the air bag is wrinkled


The reasons for this may be:


1. When the vehicle is transferred and hoisted, the air bag is stretched out more and is not restored normally, resulting in the air bag wrinkling;

2, when the vehicle enters and leaves the maintenance workshop or the large slope platform, it may also cause individual airbags to be overstretched, resulting in airbag wrinkles.


The solution:


Open the connection between the rubber connector under the vertical rod of the height control valve and the axle, lift the rod up, and then install the rod back to the normal state after all the air bags are full. In addition, if such a failure often occurs during driving, it is necessary to consider adding a limiting device between the axle and the frame.


3.The tractor and semi-trailer braking is not synchronized, resulting in vehicle braking jumping


Cause of failure:


When the vehicle is parking or reversing braking, due to the inertia factor of the vehicle, in the braking moment, the vehicle tail will be pulled up, at the same time when the handbrake braking, the vehicle tail will not be able to fall back, the height control valve is in the exhaust state at this time, the air bag pressure will be emptied, when the brake is released again, the vehicle will instantly fall or lead to the air bag fold.


The solution:


1. Parking or reversing slowly stops the vehicle and then pulls the handbrake, and the above situation will not occur.


2. If the air bag folds, loosen the connection bolt between the height control valve and the axle, completely inflate the air bag, and then reinstall the connecting rod according to the original position.




 Xuji Industrial Park, Liangshan County, Jining City, Shandong Province
+86 17686798823

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China Trailer Truck Parts Manufacturer: Semi-trailer Axles, Landing gear, Suspension, King Pins, Fifth Wheels