In all seriousness, there's definitely a problem, unless you're using full race brake pads, which themselves need to be hot in order to work well.
Check that your brake booster isn't leaking vacuum. You can try pressing the brake pedal to the floor repeatedly with the engine off. This will become progressively more difficult until it is very hard to press the pedal. It should become easy again once the engine is started. If it doesn't become harder, or doesn't get easier when the engine is started, then the brake booster is suspect.
Regardless, you should have the brake system bled. Air in the brake lines can also do this. There is a dealer service tool for the ABS systems, but it's still reasonable to be able to do it yourself and get acceptable results. If doing it yourself helps, then consider a professional job. **Disclaimer** I've never done a brake bleed for an OBDII equipped ABS vehicle, so my knowledge on the subject is second-hand. I have done brake bleeds in OBDI vehicles, and non-ABS vehicles, however.
Master cylinders usually just leak fluid, which causes air bubbles, which cause problems. If the fluid reservoir is empty or really low, you may have issues.