Ok sir ill tell you this. I got 4 wheel disc brakes. Master cyle Der is a willwood. Front calipers are willwood. I got a porpotioning valve from cpp. The bavk cipers are a gm d154 with street pads. All I iasked if and or should the brakes lock up the tires. I didnt do the math of weight vs brake pad area and force. Sorry I didn't go to collage to be a professor. I'm a blue collar guy just trying to figure this shit out. I will gladly remove myself from this form since I didn't know you had to be an collage grad. And by the way it's not idian is native American you FORDing savage. IM OUT