Finally installed discs on my bird. Great stopping power ! I bled the brakes when finished and went on a drive. Brakes workd ok but felt a bit spongy. So I decided today to bleed them again. THEY WONT BLEED! The rear brakes wont bleed . I got a littlle bit of fluid out but thats it. I didnt bleed them the first time so I decided to bleed them today and nothing. The front works fine when bleeding. I installed all new lines front to back . The master cylinder is a 78 Granada. I am using the original push rod out of the old master cylinder. I do have a rod for the new master cylinder.I push the pedal all the way to the floor and let it up and just a bit of fluid in the line. When I installed the lines I opened all bleeder screws and pumped until fluid began to seep out. I closed the bleeder screws and bled the front but not the rear. I know it is something simple but I am stumped at the moment. Any help is appreciated.

I bled the master cylinder before I installed it. The master cylinder is a reman unit.

55Birdman  Hickory NC