For commercial transport vehicles, most of them use air brakes. During normal use, as long as you pay attention to the cleanliness of the air circuit, there will generally be no major problems. On the other hand, there are two places that need to be paid attention to during daily maintenance: the wheel speed sensor and the ring gear.

The wheel speed sensor is located inside the brake shoe of the shaft head, and the periphery of the bearing in the shaft head corresponds to the ring gear. When the wheel hub is removed during normal maintenance, the top of the wheel speed sensor and the ring gear are very dirty. Sometimes even a lot of grease (butter) will be contaminated. In this case, it will directly affect the sensitivity of the wheel speed sensor. 

When maintaining the wheel hub, the front end of the wheel speed sensor and the ring gear must be cleaned and cleaned as necessary. When the oil and dust between the tooth gaps of the ring gear are serious, it can be cleaned with gasoline, diesel oil, carburetor cleaning agent, etc. to ensure the cleanliness of the ring gear, so as to avoid the ABS light and effect the Signal Acquisition.

After the wheel speed sensor is cleaned, it needs to be pushed out from the rear end of the sensor to the front end as much as possible to ensure the relative gap between the wheel speed sensor and the ring gear after the wheel hub is installed successfully. If the gap is too large, it will also affect the wheel speed. Sensor signal acquisition.

When the hub is installed on the shaft tube, adjust the direction of the hub and the concentricity of the shaft tube as much as possible to ensure that the concentricity of the hub and the shaft tube is as consistent as possible (the height is the same, the front and rear deviation is not large) to avoid the hub in the When pushing on the axle tube, it hit the wheel speed sensor, and the top of the sensor was pushed back.

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