Maybe GM did put it there, mine doesn't have one but could have been made by Joe Blow brace manufacturers. One thing about my not having a brake booster, I don't have to worry about vacuum levels, just press the pedal harder. The few times I've had to make a panic stop I was amazed at how much force I put on the pedal. It's kind of proportional to the size and distance of the truck that blows through a stop sign in front of you, the larger and closer the truck, the more force on the pedal. Old school ABS.
