Think about how your electric brakes operate. When the magnets are energized, they attach themselves to the machined armature surface of the drum. As the wheel rotates, the actuator lever is pulled, expanding the brake shoes against the drum. If the magnets are energized with the trailer stationary, the magnets attach themselves to the drums, but there is no braking action.
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Jack & Marty
2018 Laredo 298 SRL
2011 F-250 SB Crew Cab 4x4 6.7L
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