Did you just replace the calipers or drums?
You will have to bleed them a lot. My mech told me to have the brake pedal pushed down by something (in my case it's a snow brush) and open the bleeder valve and keep it open until fluid comes out. That's how he does it and he was taugh that in auto school.
Videos on Youtube show opening and closing the valve. That works too, but I was told that the other way is way to go. The main thing is to NOT let up on the brake while the valve is open because it will suck more air into the system which will make it worse

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