Excerpt from Bendix training video explaining the operation of the air dryer in the air brake system.
Bendix AD-1 & AD-2 Service Manual: https://1drv.ms/b/s!AuztCXNnVSIjiXQQ35jc1cMqywmy?e=AW5hJN
Bendix AD-4 Service Manual: https://1drv.ms/b/s!AuztCXNnVSIjiXWe4QtkJ4c7ZkbL?e=PGLGlD
Bendix AD-9 Service Manual: https://1drv.ms/b/s!AuztCXNnVSIjiXazLCOAk4B6pppj?e=G9Ga6t
