From the Airstream manuals library parts book https://www.airstream.com/wp-content...s-book-308.pdf page I-49 you have 4200# axles. Brake info is on page I-50. 12" looks like SA version in pic.
Manual adj vs (SA) self adj.
Manual brakes are the KISS version and require periodic adjustment like real old school classic drum brakes. The SA design is to eliminate periodic adjustment. If you search you will see a series of SA brake system failures. I replaced on for a fellow AS'er after parts came undone and rolled around. I believe Dexter has revised a component or two is the SA system.
Your choice.
Gary
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S/OS #001 2005 Dodge Ram 2500 5.9L 6 Speed
16" Michelins, Hi Spec Wheels, Max Brake, Dexter 4 Piston Disc Brakes, Carslile Actuator, Equal-I-Zer, Dill TPMS. Campfire cook. BMV-712. DEMCO 21K Lb Cast Iron coupler
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