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I haven’t turned a brake rotor since the early 90’s. Never turned a drum, ever. If the surface is smooth, run it. If it has excessive grooving, replace it. 8.53v is definitely a sign of a bad connection. I’d replace the complete backing plate assembly, then check the voltage at each wheel. Could be a magnet that is shorting internally, also. Once you have correct voltage at all wheels, there is a brake shoe burnishing procedure in the Dexter Axle manual that should be performed. That alone made a huge difference in braking performance on our old 2015 MHC 305RL. Have the disc brakes on our 2019 3811MS & it is a HUGE improvement over the drums. Definitely a must on a rig this big.
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