As FB pointed out how the lever moves is a function of the amount of resistance in the cable/housing and the amount of pull exerted by the caliper - in turn related to spring tension and pivot tightness. Nothing but the tension from the caliper holds the housing and cable ferrule to the brake lever. It's best to make sure both the caliper and cable/housing are working properly, which means the caliper snaps open when compressed by hand but has very little back and forth play, and the cable moves very easily within the housing. Most bikes have split cable stops on the frame which allow you to remove the housing and check the cable where it is inside the housing.