Lifetime Supporting Member
Join Date: Oct 2002
Location: New Braunfels, Texas
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The voltage at the magnet will vary according to your brake controller setting and how hard you press on the brake (if you have the Ford built in controller). Voltage will vary anywhere from 5 to 12 volts. Amperage will increase also accordingly.
Your brake shoes aren't set tight enough. Pull the pin on the breakaway and a full voltage of the battery will be going to the brakes. Adjust until the tires stop within a rotation or so. The magnets are on an arm that swivels once they receive current and stick to the inside of the drum and pushes the shoes against the drum. The higher the voltage the less the magnets will slip thus pushing the shoes harder against the drum until it stops the wheel (when not under a load, it is possible that with a large load the brakes wold not lock up).
Just keep pulling the pin and trying to spin the wheel then put the pin back in and tighten the star adjustment wheel in between the shoes until you get the desired result.
2015 F350, Cc, DRW, 6.7,4wd,Lariat
Sold 2011 F350, CC,DRW,6.7,Lariat
SOLD2006 F350,CC,DRW,4x4,6.0/5spd auto,King Ranch,moon roof,power slider,custom front bumper replacement,custom steps,custom headache rack,gooseneck hitch,tow commander,reverse sensors.
SOLD2005 Excursion Eddie Bauer, 6.0/5spd auto,dvd,steering wheel controls,heated trailer tow mirrors, reverse sensors,FrontierGear front bumper replacement,V-code springs(front)F350 blocks, 33" Dunlop Mud Rovers.
SOLD!TRUCK; '03 CC,DRW,Lariat,6.0/5spd auto,moonroof,heated trailer tow mirrors,reverse sensors,captains chairs.