Black brake fluid

[Shugalou]

I'm in the process of refinishing my booster and master cylinder so last night I take the turkey baster and I'm pulling off the brake fluid. The top layer has a nice golden hue...everything looks fine, when i get down to the bottom it has darkened right up and is looking black.

I am new to the truck but judging by the colour I'm guess that the fluid is old and broken down and was topped up more for appearances.

I plan to flush with new dot 5 and put some isopropyl alcohol before the new fluid to help clean the lines.

Just wondering if you guys have any input or suggestions?

Thanks