What are the manifestations of a damaged car dryer?

[DiCarmen]

Here is the relevant introduction to the manifestations of a damaged car dryer: 1. When the compressed air from the air compressor enters the dryer and leaks out through the throttle valve chamber, it indicates that the piston or O-ring seal in the dryer's throttle valve is damaged, dislodged, or scratched. Immediate inspection, cleaning, or replacement is required. 2. When the compressed pressure reaches the specified standard value, the dryer's exhaust valve D cannot stop exhausting under normal working conditions, indicating that the piston is stuck due to foreign objects, scratches, or jamming and fails to return. The small piston and O-ring seal should be promptly removed for inspection or replacement. 3. The air compressor is in good condition, and the dryer's intake is normal, but the outward output is extremely poor. There are two possible causes: first, the desiccant contains excessive moisture, oil, or impurities, thus blocking the air passages; second, the one-way valve for the dryer's outlet is stuck, indicating that the dryer has not been maintained for a long time. The dryer assembly should be removed for a complete system maintenance.

[VonAniyah]

I've been driving trucks for over 20 years, and when the air dryer fails, it's very noticeable. You'll hear a hissing sound when braking, like wind blowing through a hole. The pressure gauge needle becomes unstable, suddenly dropping to the warning line, especially when braking continuously. This leads to longer braking distances, which is more dangerous on wet roads in the rain, and the pedal feels soft and unresponsive. I often check if there's water leaking from the bottom of the air reservoir, and if I find any accumulation, I fix it immediately, as water can corrode the pipelines. Remember to have the mechanic check the dryer filter during regular maintenance; replacing it frequently can save money on major repairs. Before long trips, I make it a habit to feel around the dryer connections with my hand, and if I detect any air leakage, I replace it early. Even though car parts may be small, safety is never a small matter.