Got a "service stable track" indication and brakes would lose assisted power randomly while driving down the road. (which is not very safe.) before this i had a similar problem with loosing assisted brakes after stopping that dealer replaced the brake booster just after i bought it. this time i took it back to the dealer i bought it from and the computer was throwing lots of weird codes. so they took it to the chevy dealer and they determined that the bolts that mount the ebcm to the bpmv were loose. they decided that the bolts weren't tightened enough from a warranty repair on the bpmv that i didn't realize was done less than two years ago since i bought the car used. technically i feel like we don't really know for sure if the bolts were tightened to the correct torque in the first place or not. i have seen a number of brake problems reported on this model. it sounds like the issue could cause false codes to be reported because the ebcm is not grounded well and also causes air getting into the brake system. my concern is this might not be an isolated incident, but i don't know for sure.