The brake components are made of rubber. Rubber (not to be confused with Neoprene, Nitrile, or Buna) is not compatible with oil or any petroleum products. It will swell, loose it's ability to seal, and cause the pistons to bind in the cylinders. The binding will cause the shoes to not retract, and the master cylinder not to retract far enough to open the bypass port, resulting in the fluid building pressure, and the brakes failing to release, and over heating. Same thing with the hoses, they will swell internally, blocking or restricting the flow to and from the wheel cylinders.
The rust pits are not caused by the oil. Chances are, at the age of the vehicle, the cylinders were long ago beginning to rust pit from moisture in the system, a very common problem in older vehicles.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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