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Before we installed the AP Racing big brakes, we first took our '04 GMC Sierra out to our test facility, installed the Racepak GPS data acquisition software to the truck, and blasted the truck to 80 mph. Well, blast is an overstatement in stock trim, but we did make it to the magical number and with the brake pedal pressed to the floor, we measured several 80-0 mph passes. The average stopping distance was 340 ft or the equivalent of 8.5 school buses. After several panic stops, the brakes got hot and the truck stopped in 404 ft or more than 10 buses.