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If the flex lines are only 2 years old, I would think they would be good, unless some really cheep import parts(who knows, these days). Take flex line off and test with air, it should be unobstructed.
The black fluid part makes me wonder if some other (petroleum based) contamination got in...
Your combination valve may be stuck. That controls light and also stops flow to fluid low (ie leaking) part of system (front or back) so the other half still works. If you did have DOT 5 in there at first, that might explain it sticking, as mixing the two types of fluid can really gum things...
It is common for the rubber flex lines of this age to internally collapse even though they look fine from the outside. Suggest replacing all 3 if they are original.
The fluid probably is not the problem unless you mixed DOT 3 (alcohol based) with DOT 5 (silicone based), in that case you need...