a few years ago i had a ke70 and i used ra40 celica struts which had large ventilated dics just had to file the to holes on the bottom of the strut to fithad to have it w-alig aligment but it stopped three timesd as good that maybe somthing that may help you as well.
thanks for the info on the brake conversion i have a 12a turbo,corona 4 speed,hilux diff and front brakes were the next issue for a ke70.would be interested to know what master you would use?