I HAVE A SENTRA 93 XE AND I HAVE SOME PROBLEMS WITH MY BRAKES, THE PEDAL IS GOING ALL THE WAY DOWN, SO I BLEED MY BRAKES AND I STILL HAVE THE SAME PROBLEM, SO I DONT KNOW IF IS MY BRAKE MASTER CYLINDER IS BROKE OR IS DOING THAT BECAUSE I PUT DISC BRAKES IN THE BACK FROM A NISSAN PULSAR. "THANKS FOR UR HELP" AND SORRY FOR MY ENGLISH : )

So let's get this straight. You swapped out the factory drum brakes for a disc setup from a Pulsar?