bleeding brakes

with all 4 corners bleeders open ... GENTLY apply brake pedal half way a couple of times until fluid starts to leak out ... USUALLY fronts will start first ...once you see fronts leak out close off front bleeders ... BUT not completely to allow some trickle of brake fluid out ... and leave rears open ... again gently apply brake pedal several times ... half way down until rears start to leak out .... once you get fluid from rears ... then gravity bleed all 4 corners ... once this is done ... you will either need second person to assit OR use a mighty vac .... to gurantee all air out .
hold off valve ...i would assume a restrictor ...