I know someone who did the MC up grade on a 1990, so I would think it would work on any GMT 400 1988 up.
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Hmmm. I installed an nbs master on my 98 burb K1500 with the 11" rear brakes. Truthfully, I didn't like it. The rear brakes always engaged first and the pedal was really hard. While a firm pedal sounds nice, it was much harder to push and didn't feel right. I put the old mc back on. Since I now own the new mc, I may try it again with some 1 ton calipers at some point although ultimately I would like to go to the new 13" rotors and dual piston calipers by installing a gmt800 knuckle.