Not ambient temperature!
Regardless of the temperature fluctuation in California or a garage, the temperature of your engine bay fluctuates ~ 150 degrees. When brake fluid gets hot, either from the brake itself or otherwise, it expands a great deal - hence air brakes on trucks. Why don't you check it as the car cools and see if there is a correlation? Maybe one of your new components is dragging and heating up one of the brakes. Have you checked each wheel for heat after driving? How did the rotors get to the point they required replacing in the first place?
1982 Mercedes-Benz 300CD
1982 Mercedes-Benz 240D - stick