Fade means your way beyond what the fluid should be taking.
Its a minimum of once a day when on track.
The fluid is deteriorating each time it gets over 3 or 4 hundred degrees. If your going into any braking zone at over 120 your at the fluid limit for temp in about 2 laps.
I've used ATE but find the Motul lasts as good and is about 1/2 the price. That or buy the "special" ford truck fluid which is essentially ATE super blue in a ford labeled can if the MSDS is any givaway....
AS I mentioned before you want ot keep an eye on the dust seals because when the dust seal starts cracking you have also likely cooked the caliper piston o-ring. When it gives up brakes no worky worky......
Of course I'm usually working on rental cars and I do not want the customer having brake problems. If it was me Its my call....
Dave