the T100 has the 1" bore master cylinder. i just did rear disks and put on the 1980 supra rear calipers. the master cylinder does appear to be able to keep up. i am not sure if the T100 front calipers are any bigger than the V6 minis. The T100 engineers stole a lot of parts from those trucks. Has anyone had experience with this and needed bigger than the 1" master? i can double pump and get better braking. I can push all the way to the floor on one pump and get it to stop. it is just a PITA. since it is about to get the dana44 brakes up front, i wonder whether i should just get it over with now and put the chevy master cylinder in. does anyone have a dana44 front with rear disks and a 1" bore toyota master and have it work? teh FJ80 1" setup has residual valves for front and rear, but i am not sure if the T100 would since it had rear drums.