So got my wheels mounted and went to install brake calipers back on rotors. Got that done but Im having problems being able to get any brake pressure from either the front and rear. Now the rear was never touched all I did was take the caliper off the rotor and that was it. I do have an aftermarket rear set attached now but i can push down on it for days and it wont build pressure. I opened the bleeder value in the back and pushed down and brake fluid came out so I know its pumping but it wont build pressure. Now the front was completely drained and im trying to feed the fluid back in but none wont leave the resevior. Whats a good way to get these brake back working???