Started last week. Start the LT (03) and the brake system goes through it's checks, brake light goes from flashing fast to flashing slow. Ride away and the light goes out, like it always does. Within a minute I have a brake failure light and a caution light. Shut it down and it resets. Comes back again, until the machine warms up. Fluid levels are OK. Dealer is going to take a look and see. I'll post and let you all know what it was/is. Got to be better news than the truck, new transfer case on the way for it. They don't build Chevys like they used to.