I converted to a 2.5" drop wide 5 empi disc brake kit, I have great pressure on back brakes and have bled and bled and bled and have no air in the brake system but also have no brake pressure on the caliper, I can turn the rotor by hand with pedal depressed?? I have a dual circuit master but not a disc brake master! could this be the difference that I need more fluid to get to the caliper? Help!!