Service brake system
Here's the scoop. My Brake light comes on and "Service brake system " comes up in the DIC of my 2005 Sierra 4wd. This happens when i brake hard and do not activate the ABS, also happens if i brake hard enough to activate ABS and also happens if i spin rear wheels from a light or stop sign. I tested all of this this moning on way to work since it was raining and easy to do all tests .. It does not happen if i brake "normal" and come to stop. Thoughts?