Early 1960s: Brake air dryers

December 16, 2010  | by: Max Heine

Air from the compressor contains a lot of moisture that condenses out of the air as soon as it cools because of the pressure. While the “wet tank” provided a collection point, some moisture would pass into the system, especially when the tank was not drained regularly. The air dryer provided heavy finning that cooled the compressed air quickly, while also using a small pressure drop to twist the air and sling moisture outward by centrifugal force.

This separated it from the airflow and it was then collected in the dryer’s base. The dryer would then periodically open a valve to drain itself, thus eliminating the moisture. This greatly reduced corrosion and deterioration of brake system components, while also reducing cold weather brake system freeze-ups and the need to add alcohol to prevent brake system moisture from freezing. Brakemaster developed the first brake air dryers.

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