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Thomas, this is a hydraulically actuated trailer brake controller.  Today, controllers are electronic, and most new trucks come pre-wired for an electronic controller.  When your 1973 I-H 1210 was built, a brake controller was aftermarket installed.  This type of hydraulic aftermarket unit was popular.  

The condition of this controller is likely questionable.  It hooks into the braking system at one end of the dual master cylinder.  The brake piping looks somewhat crude.  This was either dealership or aftermarket owner/shop installed.


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