88 crx brake conversion

I just did a rear drum brake to disc brake conversion and put bigger rotors on the front on a 88 crx. I put in a brake boost and master cylinder in off the 93 integra that the other parts came off of. I have bled the brakes out and am getting no more air. The problem I am having is that when I start the car up the brakes become very spongey and dont hardly work at all. Does anyone have any ideas for me? Thanks for you help.

you might need the 40/40 prop valve.

even though you arent getting bubbles when bleeding the brakes, you may still have air in the lines. make sure you bled the brakes in the right sequence. otherwise, the bleeding isnt fully effective. there should be a diagram in your owners manual (or any shop manual for your car) indicating the right order.