Hmmmm....Brake fluid of DOT 3,4 and 5.1 will imbibe water and increase corrosion on exposed mild steels in my experience. Silicon based DOT 5, which I used in auto racing applications is not hygroscopic. I would think the hygroscopic fluids left in contact with a steel cylinder liner would make the problem worse. Then again...in theory only...I've never tried what your mechanic has suggested and I am not a professional mechanic.
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