You have air trapped in the lines.
Try bleeding the brakes this way… With somone helping you open the bleeder farthest from the master. Have the person in the car push the brake pedal down BUT not all the way to the floor, have him hold the pedal in that postition while you close the bleeder, after it’s closed he can release the pedal.
Repeat this 4-5 times and then move to the next bleeder.
You will notice big burps of air coming out of the bleeders but you might not get the air burps until the 4th or 5th time you open the bleeder.
After you finish all four try starting the car to see how the pedal feels. If it is better but not quite right you might have to bleed the brakes again.