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It's called a PRE-production vehicle.Whats with the "No Vacuum brake Assist"? Why would you need to idle for 60 seconds? Sounds like pressure is being built up somehow. Maybe some Electric-Hydraulic system?
I would think that GM would have enough data on Vacuum Assist(power brakes) to be able to put a unit on it. Plus, I have seen thousands of pre-production test vehicle photos and how many had that warning on the steering wheel and the driver side window?It's called a PRE-production vehicle.