joker97: umm brakes stop the tyres, the tyres stop the car?
But the OP was not stating that the tyres were locking, therefore the tyres were sufficient for the job.
The brakes, by all accounts got too hot causing the rotors to apparently warp.
This can happen on any car where the brakes are used excessively.
I am a fan of upgrading pads, fluid and rotors on my cars, usually for towing purposes as I don't have a light sports car any more.
Above should stop brake fade, in fact if you go for a pad like the Bendix Ultimates I found that they braked better with some extra heat in them... to a point, I never found that point but there will be one.
There is discussion over engine braking with an auto, I believe if this is done, I.e. using tiptronic to change down gears to slow rather than dropping down a gear to hold speed, which are 2 very different things and very different pressures on the trans.
In the end most cars have inadequate brakes for harsher driving conditions, this should be factored in how these conditions are approached. I regularly tow a horse float with horse and all my gear for weekends away, this adds up to 1200+ kg to my cars weight, this needs to be factored in when I choose my stopping, following distances and my speeds.