I have had Hayes brakes and would not recommend them for this reason. The single spring does not center the brakes shoes as well as the double springs do. This has a tendency to leave the forward shoe in contact with the drum after the brakes are released resulting in a HOT SHOE.
You may not feel this but if you have an exhaust gage on your diesel you will see it in the exhaust temperature.
Complete new backer plates and assembles are to cheap to run the risk.
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