You can buy a brake fluid tester for under £10, you will be surprised at the results you get with one.
The shocking thing is brake fluid once opened and left on the shelf will fail a test after a couple of months so if you do use some brake fluid make sure it is fresh.
As far as replacing brake fluid I was shown a neat trick. Undo the blead nipple on one wheel at a time with a piece of tubing attached, allow the weigh of the fluid to drain the fluid and keep topping the reservoir up, you will notice the colour change when the new fluid comes through. No air is introduced so no need to bleed.
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