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2026

To prevent brake failure, how often is it reasonable to replace the truck's drying tank?

Regarding the dryer tank, I believe all truck drivers are familiar with it. It is a device used to filter the water vapor in the compressed air within the air system, preventing the air reservoir and various pumps and valves from corrosion. Whether the dryer tank can function properly even directly affects braking performance. Therefore, today I will share with you the importance of the dryer tank and the standards for its replacement.

　　How to choose a drying tank?

Generally, the air outlet of a drying tank uses holes with a relatively large diameter. At first glance, this design doesn’t seem to be a problem, but if thinner filter paper and smaller-diameter desiccant are used, the higher pressure can push the internal desiccant out, directly into the vehicle’s air circuit, causing the air circuit to be blocked and creating safety hazards.

Therefore, when choosing a drying tank, it’s better to select one with more and finer air outlet holes and a stronger structure. After all, compared to the desiccant particles inside that cannot be seen, this method of identification is simpler and more intuitive.

How often should the drying tank be replaced?

Many truck drivers say they don’t know when they should replace the drying tank; generally, as long as the vehicle has no problems, it may not be replaced for several years. Since the service life of drying tanks varies by brand and the climatic conditions in which the vehicle operates are also different, the replacement cycle is actually hard to standardize. If drivers really don’t know when to replace it, they can use the following methods to determine it.

　　1. Observe the appearance of the dryer tank

When the dryer tank has been in use for a long time, there may be air leaks at the bottom of the tank, with internal water vapor escaping through the gaps in the tank, leaving visible marks. From the appearance, if there is a certain degree of oil leakage at the bottom, it indicates that the internal desiccant has long been ineffective and cannot adequately absorb moisture, causing increased humidity in the truck's air system and condensation water. At this point, the dryer tank needs to be replaced.

2. The vent valve at the bottom of the air tank

Another method is to check the vent valve at the bottom of the dryer tank to see if the bottom of the air tank is damp or has water. Since the valve is located exactly at the bottom of the air tank, and water has a higher specific gravity, if the dryer tank fails, the moisture in the air system will naturally accumulate at the bottom of the air tank due to gravity, which is just above the valve.

　How to properly replace the air dryer?

After cleaning off the oil or water stains accumulated at the bottom of the air tank, you can replace it with a new air dryer. However, it is important to remind truck drivers that because the air dryer is connected to the air circuit, there is a certain pressure difference between the inside of the tank and the outside. If you dismantle it recklessly without releasing the compressed air, it will cause the compressed air to release instantaneously, which can easily injure the person dismantling it. Therefore, you must first empty the air from the air reservoir (by repeatedly pressing the brake until the pressure gauge reads zero) before removing the air dryer. In daily use, it is also good practice to regularly check the air tank drain valve.

The air dryer is an important component for ensuring driving safety on trucks. Using substandard products or failing to replace it for a long time may result in loss of dehumidifying performance and severely affect overall braking safety. Especially as the rainy season is approaching, truck drivers should pay close attention to whether the air dryer is functioning properly and replace it in a timely manner to avoid greater losses caused by small issues.

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