Turning throttle cable to break n break to throttle??

I have converted the front brake lever into a throttle on a CR250. My buddy had a cast on and wanted to ride. I asked him what he could move and he said "My trigger finger". So I removed his front brake embly completely without opening the hydraulic lines. I installed a cable type front brake perch and lever,or a clutch perch and lever upside down. Then installed the throttle cable and a spacer to take up slack. His friends said he would die, but it worked well and he never tried to brake with it. Is your front brake cable or hydraulic?