My 2006 Stratus sometimes the brake pedal will try to go down. This only happens occasionally and I can't make it happen. I bled the brakes and put new brake fluid in. It all works fine except every few days the brake pedal goes down. I don't have any idea what to do.

 

Bleed the brakes again. Check wheel cylinders/calipers/lines for leaks.

 

Yeah, I tried all that, went over it from beginning to end. I don't see anything wrong. I can't reproduce this problem to show it to any body either. I suspected the master cylinder, but I don't see why it would work fine for weeks then suddenly not work. A real puzzle.