That's weird. If you set the regulator to 15psi or so, fluid should come out at each bleeder screw. I've heard that 25-30psi
may be required for ABS systems but I haven't had to do that with mine. It's also possible that your bleeder screw(s) are plugged with dirt, preventing fluid from coming out. They're supposed to have little rubber caps on them to avoid this problem. Don't forget to use DOT 4+ fluid, btw.
