Remove the drums and inspect the brakes and drums while packing the bearings.
If you need brakes replace the complete backer plate as that is cheaper than buying the parts. $49.00.
Drums should be OK 90% of the time. If scored or blue color replace.
Trailer Brakes | etrailer.com
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles