I started up my truck this morning (2004 GMC 2500HD LB7) and the "service brakes" warning came up on the display and the ABS and Brake indicator lights were lit up. I checked the brake fluid level and it was fine. I checked my brake pads the last time I rotated my tires and they had plenty of life left. I drove it down the road a few miles and all the lights and warnings turned off. Has anybody else experienced a similar problem or have any idea what it could be? I plan to take it to the dealer to have it checked out, but I don't want them to look at me like I'm on crack and tell me nothing's wrong.