When I push the brake pedal and it goes to the floor,
I notice very quickly!
Seriously;
Condensation in the brake fluid causes the fluids boiling point to change. It is not brake fade. It is an issue with heating, or boiling, the brake fluid. If the pedal goes all soft, (usually) You have not faded the brakes, but likely boild the fluid. That big ol' Dodge, on a short track, really could heat up the brakes.
Brake Fade is usually caused due to (A) "Green Fade" - The natural process of bedding the brake pads; Or (B) "Pad or Compound Fade" - Due to brake pad, or compound, exceeding it's temperature limits. The symptom is usually a normal pedal (high and firm), but almost no stopping power.
The cure - go to a harder, more heat resistant, brake pad; or, improve cooling to the rotors.
Hope that helps some.
Steve