Need help troubleshooting problem with brakes

Bleed more.

Did you...

1. Change the master?
2. If so did you PROPERLY bench bleed it?
3. Did you remove the residual pressure valve from the drum circuit if using a stock disk / drum master cyl
4. Tell us more about your rear disks
5. What brand what type of e brake
6. Did your power brakes work properly before your change to 4 wheel disk