[alfa] brake fluid and rust

[Keith Walker <100662.3423@xxxxxxxxxxxxxx>]

>>Brake fluids are hygroscopic, water attracting, not necessarily air
attracting. Clearly any air in brake fluid would have to remain dissolved
or non existent, those would be the only options, or the hydraulics simply
wouldn't work. I think brake fluid will not dissolve air.<<

However DOT 5 brake fluid is not hydroscopic. It will not absorb water.
Any water that is in the system will cause problems but unlike normal
fluids it does not absorb it from the air.

Therefore if you ensure the system is fully cleaned out without a trace
of water it should be fine for far longer to use DOT 5 than DOT 3 / 4
fluid.

All the best

Keith
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