Where is an air dryer installed in an air brake system?

The air dryer in an air brake system is installed in the compressor discharge line. This placement is crucial because the primary function of the air dryer is to remove moisture, contaminants, and oils from the compressed air before it is distributed to the braking components of the system. When compressed air passes through the air dryer, moisture is collected and removed, ensuring that the air supplied to the brake system remains dry and clean.

This is important because moisture in the air brake system can lead to various problems, including freezing in cold weather, which could block air flow or water accumulation that may cause component corrosion. By installing the air dryer in the compressor discharge line, you ensure that the air being delivered to the braking system is optimally dry, helping maintain the efficiency and reliability of the air brakes.