Just noticed today the brake pedal on my CC 2500HD seems to be going closer to the floorboard than I have become accustomed to. With the engine off, the pedal depresses about half way to the floor and stops. With the engine running, the pedal can be depressed about an inch before a resistance is felt and the resistance remains constant as I depress the pedal all the way to the floor. I checked the fluid level in the brake reservoir and it is up to level and there is no sign of leakage in the engine compartment or the garage floor. Anybody else experience this problem or can diagnose the problem?