Wet Brake, Dry Brake (Left Brake, Right Brake...) - 64 Valiant

I differ in opinion from some. Brakes on one side look new inside but look crusty on the outside. Obviously someone has repaired a previous problem without touching the other side. You can clean the outside by using any of the suggestions. If you disassemble the axle assembly, you should replace ALL gaskets and seals. There is a 5-hole metal gasket that goes between the housing and the backing plate. They have been known to seep and produce the crud on the backing plate you see. Using a little silicone here helps. Axle seals- you have an inner and an outer. If you were getting gear lube on the brakes, then obviously these need to be replaced. How is the axle bearing lubricated? Not from gear lube!- remember the inner seal? Pack the axle bearing well. Now you have a 5-hole foam gasket, it is important! This one stops any seeping of that axle grease onto the brakes. You are learning a lot about your brakes, I hope this helps put things in perspective.