SSBC disc brakes won't stop

Im going to just remove the rear brake line and see if the fronts will work without the backs hooked up. Id like to see them lock up and skid the front tires if thats possible at all with manual disc brakes. I bleed them a bunch but you never know I guess there could be some more air n them. Hopefully tomorrow ill end out. Ill get back to let you know how it went. Thanks everyone for the help.