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Drum brakes have no central device, they are wires to the 7 pin and the truck operates the brakes. If, as you have said the breakaway operates the brakes the issue lies between the truck and trailer or in the truck brake controller. You may have to set the gain up higher to actuate the brakes a noticeable amount. If i remember correctly I ran the gain on my ford at 9 when i had drum brakes on my 3761FL. With my new disc brakes it is set at 6.5
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2021 Montana 3761FL, 9 LIFPO4 batteries & 1700 watts of panels w/ Multiplus II 3K inverter and 30amp DC to DC charger from truck. 8k Dexter axles w/ Kodiak disc brakes.
2019 6.7 diesel F350 DRW with Banks derringer and 4"exhaust, airlift bags, 25k B & W Companion hitch, 45 gal. aux. diesel tank and 14k Winch, just in case!
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