Twingo 133
It happens...and when travelling at that speed braking on and off, fade is the last thing I want. Considering I've experienced it so far is warning sign to upgrade.
Once you get brake fade that means you have boiled the brake fluid therefore lowering the boiling point of it for next time.
So the problem is going to be more regular until you have changed the fluid for a quality one.
I have had brake fade bedding in pads on my 4pots before.
Changing the fluid to proper fluid (not your normal motor factors stuff) i have never had it again.
Put some Castrol Response dot 4 in and see if that remedys your problem.
Alot cheaper to try than all these expensive kits.