First, I would check to see if all the wires to the wheel backing plate are connected and carry power to the brakes. If that checks out oK, next would be to pull the brake drums and take a look.
A broken wire = no brakes.
2012 Fun Finder XT 276 Toy Hauler & Harley Davidson Ultra Classic with Condor wheel chock
2014 Dodge Ram 2500 AT 4X4 Crew Cab 6.4 L Hemi, 373 gears, tow package, Rambox option, Revolver X2 tonneau cover, Equal-I-zer anti-sway hitch.