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 - Tractor Profile: Silver King - by Staff. Silver King tractors were produced by the Fate-Root-Heath Company of Plymouth, Ohio. The company was founded by John Fate in 1884 and was originally called the "J.D. Fate Company". After several mergers over the years, the final company name of Fate-Root-Heath came about in 1919. The first tractor produced was actually called the "Plymouth" tractor and was powered by a 20 HP 4-cylinder engine with a 3x4" bore and stroke. The four speed transmission had a top speed of 25 mph! After more t
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