I have a 2008 Mazda 3GT. Occasionally, about once or twice per month, when I back out of my driveway, foot on the brake pedal, I complete the reverse and come to a stop on the road. Before going into Drive, I find the brake pedal action spongy and even goes down to the floor. Once I remove my foot completely from the brake and then down again, I have normal brake action. The master cylinder and the ABS pump have been replaced and the problem still persists.