When the safety plug is pulled out of the box, the brakes are being applied and if you go back to the axle and get really close you can hear a humming sound coming from the brake drum. Put the plug back in and go back and listen again and there should be no sound. That's a quick and easy way to verify the brakes have indeed let go.
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2013 F-150 EcoBoost MaxTow, Roush tuned (415hp 506tq), lifted on 33s, R.A.S.
2013 Jay Flight 28BHS Elite (Equalizer 10K hitch)
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