Hi all, need some help. 99 C1500 Suburban, 5.7 vortec, all stock. Drove it 150 miles Saturday, no issue. It sat all day Sunday. Drove it today, several places, no issue. Came home for lunch, went to go back to work, started up fine as usual, but the brake warning light is on. Truck stops fine, pedal feels normal. What should I look at for this? I believe the fluid levels are okay. Did front pads 3 weeks ago, no issue from that. Thanks in advance for any assistance!