Checked temp on trip. 1 was hotter 2 we're about 15 degrees cooler 1 was about air temp. Changed out all brakes, backing plate assembly. 3 were greasy on magnet.1 of them had a broken magnet wire. Hot 1 was probably doing the most work, last year when I replaced grease seals and packed bearings it was the messeyist, I cleaned drum with brake clean. Fixed wires, cleaned all drums good, packed bearings,1 replaced metal flakes,adjusted manual adjust brakes, checked truck connector wires. Good to go I hope