hi i have a nissan serena and i put new shoes on the back i lost all the fluid dont ask how so i filled it all up once brakes was on and bleed it from master front ones working now i get the fluid all way to compensator valve there 2 pipes that go in and one out to back brakes the 2 going in fire but i get nowt out on the way to the back brakes i bleed the valve and it works fine the fluid comes out but 4 love or money can i get it to come out to go to back brakes and im on my 3rd valve from scrapyard and help would be gr8 cheers